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(Click for frequent words.) 70 Rolls Royce Trent 65 A#s [002] 63 superjumbos 61 CFM# engines 61 Qantas A#s 59 Airbus A# superjumbos 59 GE# engines 59 Qantas A# 58 Airbus superjumbo 58 Qantas superjumbo 58 superjumbo 57 PW# engines [001] 57 Rolls Royce RB# 57 flight QF# [002] 57 superjumbo jets 56 CFM# 7B engines 56 Airbus A#s 55 turboprop engines 55 General Electric CF6 55 Engine Alliance GP# 55 turbofans 55 Airbus A# jetliners 54 General Electric GE# 54 GE# #B engines 54 Qantas A# superjumbo 54 QF# [002] 54 IAE V# engines 54 Boeing #s 53 Airbus A# superjumbo jet 53 superjumbo jet 53 A# superjumbos 53 engines 53 Dreamliners 53 A# jets 53 turbofan engine 53 V# engines [002] 53 ZA# 53 Airbus superjumbos 53 CFM# 5B 53 Airbus A# aircraft 53 turbofan 53 Rolls Royce RB# engines 52 Airbus SAS A# 52 CFM# 5B engines 52 AirbusAirbus 52 Rolls Royce RR.L 52 GP# engines 52 super jumbos 52 Airbus jets 52 GEnx engine 52 GE Honda HF# 52 CF# engines 52 CFM# engine 52 RB# engines 51 Airbus A# superjumbo 51 turboshaft 51 double decker A#s 51 GEnx engines 51 GE# #B 51 Qantas Airbus A# 51 turboshaft engines 51 Airbus SAS A#s 51 CF6 engines 51 Trent XWB engines 51 Qantas QAN.AX 51 Airbus A# 51 double decker Airbus A#s 51 flight QF6 51 CF6 engine 51 Q# turboprop planes 51 twinjets 51 Qantas flight QF# [001] 50 GEnx 50 Q# turboprops 50 GE CF# 50 F# engines 50 JT8D 50 horizontal stabilizers 50 Q# aircraft 50 CF6 50 turbofan engines 50 airframe 50 thrust reverser 50 Rolls Royce Trent XWB 50 MA#s 50 Trent XWB 50 super jumbo jets 50 GE# engine 50 Tech Insertion 50 Q# turboprop 50 Airbus A#XWB aircraft 49 PW# engine [002] 49 #-# Dreamliners 49 Q#s 49 PW# engine [001] 49 PW#G engines 49 Safety Bureau ATSB 49 aero engine 49 airworthiness directive 49 wiring bundles 49 Rolls Royce Plc RR.L 49 CFM# 5B engine 49 pitot probes 49 geared turbofan engines 49 B# #s 49 V#s [002] 49 fuselage 49 geared turbofan 48 #T Turbine Mallards 48 Thales pitot probes 48 Bombardier turboprops 48 Rolls Royce 48 A# jetliners 48 ATR #-# turboprop aircraft 48 engine 48 Koito seats 48 Airbus A# double decker 48 General Electric GEnx 48 #-# Intercontinental 48 A# superjumbo 48 midair disintegration 48 GE CF6 48 Qantas jetliner 48 LCAL 48 CF# #E 48 Boeing #-# Intercontinental 48 Rolls Royce BR# 48 pitots 48 LTS# 48 Qantas jumbo jet 48 #NG 48 #ER airplanes 48 spokesman Marc Birtel 47 GEnx 1B 47 landing gear 47 PW#C 47 TPE# 47 hydraulic fluid leak 47 G#s [001] 47 Bombardier Q# aircraft 47 Rolls Royce RR.L Quote 47 super jumbo jet 47 Airbus EAD.PA A# 47 JT#D 47 Flight SQ# 47 double decker Airbus A# 47 PW#G 47 Boeing BA.N 47 Boeing B# #s 47 ATR #-# 47 Advantage# TM 47 A# double decker 47 B# #ER 47 JT9D 47 Group Plc RR.L 47 Honeywell TFE# 47 Rolls Royce PLC 47 seat CRJ#s 47 CFM# 7B 46 Boeing #-# 46 Qantas 46 B#s [001] 46 narrowbodies 46 Dornier #s 46 ADIRU 46 Avro RJ# [001] 46 A# super jumbos 46 Embraer jets 46 A# [001] 46 aircraft MSN# 46 airbus A# 46 MSN# 46 Dreamliner 46 Falcon 7X 46 CJ2 + 46 PW#F engine 46 Boeing #NGs 46 PW# engines [002] 46 PW#F 46 Fairchild Metroliner 46 A#neo 46 #-# jumbo jet 46 aircraft 46 Yemenia A# 46 Airbus jetliners 46 #-# Freighters [002] 46 airspeed probes 46 #NG aircraft 46 Rolls Royce PLC RR.LN 46 #-# freighters [002] 46 CFM# 46 IAE V# 46 ATR# [001] 46 Tu #s 46 CF6 #C# 46 Dash 8s 46 PW# [002] 46 radar evading fighter 46 Bombardier Q# 46 airspeed indicators 46 superjumbo Airbus A# 46 A# MRTT 46 airspeed sensors 46 Turbomeca engines 46 Airbus 46 flight QF# [001] 45 jackscrew 45 geared turbofan engine 45 #ER jets 45 widebodies 45 Worldliner 45 PurePower engine core 45 #NGs 45 #ER jetliners 45 sharklets 45 Flight QF6 45 QF6 45 Boeing Dreamliners 45 Geared Turbofan 45 Rival Airbus SAS 45 nutplates 45 Boeings 45 ERJ #s 45 Airbus A#/# 45 turbine engines 45 CRJ# [002] 45 Gulfstream G#s 45 airframer 45 #E#s 45 GE CF6 #C# 45 8I 45 Airbus A# freighters 45 widebody airplanes 45 Sikorsky S 45 AW# helicopters 45 A# superjumbo jets 45 Qantas Airways Ltd. QAN.AU 45 airworthiness 45 Airbus A#neo 45 #ER aircraft 45 A#/A#s 45 Geared Turbofan engine 45 A# Elites 45 EASA 45 twinjet 45 A# Airbuses 45 Dreamliner jet 45 horizontal stabilizer 45 thrust reversers 45 BAe 45 avionics hydraulics 45 F/A-# fighter jets 45 Beech #D aircraft 45 A# XWBs 45 MRTT 45 STOVL propulsion system 45 Falcon #LX [001] 45 FlightBlogger 45 Bredfall 45 #EX EASy 45 Airbuses 45 uncontained engine failure 45 APS# APU 45 microscopic cracks 45 #BCFs 45 #E# airliner 45 XWBs 45 Canada PT6A 45 F# engine 45 #LRs 45 Boeing Dreamliner 45 #ER [001] 45 AW#s 45 Bombardier CRJ# [002] 45 PurePower TM 45 shorthaul flights 45 RR LN 45 ATR #-# aircraft 44 turboprops 44 #ERF 44 shipset 44 EH# [001] 44 A#/A# aircraft 44 Rolls Royce aero 44 Abu Dhabi Etihad Airways 44 CF# #A 44 Airbus A# super jumbos 44 Group PLC RR.LN 44 Canadair Regional Jet 44 widebody jet 44 #ER Freighters 44 Roll Royce 44 turboprop aircraft 44 Bombardier Q#s 44 double decker A# 44 Airbus A# airliner 44 #LR 44 jumbo freighter 44 incorrect airspeed 44 PurePower PW#G demonstrator 44 flight SQ# [001] 44 CRJ# [001] 44 turboprop planes 44 Federal Aviation Adminstration 44 STOVL 44 nacelle thrust reverser 44 Grumman G 44 Airbus A# aircrafts 44 Airbus EAD.PA 44 aircaft 44 GEAE 44 CF6 #A 44 Fadec 44 subsurface cracks 44 fatigue cracks 44 Superjumbo 44 A# jumbo jets 44 Airbus A# XWBs 44 LEAP X1C 44 luxury carrier Vistajet 44 CC #J 44 Rolls Royce Turbomeca 44 Flight QF# [001] 44 Airworthiness Directive 44 Branch AAIB 44 Boeing jetliners 44 airframes 44 Airbus airspeed sensors 44 Q# Bombardier 44 uncontained failure 44 AAIB 44 BBJs 44 powerplants 44 Turbomeca Arriel 44 jetliner 44 test airplane ZA# 44 A#neo aircraft 44 Falcon #EX [003] 44 & Whitney PW# 44 composite fuselage 44 turboprop airplanes 44 #F freighters 44 fuselages 44 Cessna Citation XLS 44 Flyington 44 A# #F 44 FARNBOROUGH AIR SHOW 44 Qantas superjumbo jet 44 static airframe 43 website Flight QF6 43 Nimrod fleet 43 #ERs 43 Lelaie 43 CF6 #C# engines 43 seat Bombardier Q# 43 RAF Nimrods 43 deactivation switch 43 A# airbus 43 & Whitney PW#G 43 Airbus Corporate Jetliners 43 A# #s 43 MD# aircraft 43 gearbox 43 Garuda Airlines 43 Trent #EP 43 AE #D# engines 43 Twin Otter plane 43 turbo prop engines 43 A-#/# 43 engined A# 43 turbojet engine 43 Airbus A#XWB 43 riveted joints 43 turbine blade 43 BA.N 43 B#NG 43 Blended Winglets 43 superjumbo A# 43 turbofan jet 43 Falcon #LX [002] 43 pilot Wolfgang Absmeier 43 superjet 43 AW# Ke 43 turbine disc 43 widebody aircraft 43 composite airframe 43 B# #ER aircraft 43 planes 43 A#XWBs 43 ATSB 43 F# propulsion system 43 TotalCare ® 43 corroded pipeline 43 CRJ# NextGen regional [001] 43 jetliners 43 B# #ERs 43 BAe #-# 43 Citation Sovereign 43 Qantas jumbo 43 airframe modifications 43 CRJ# regional [002] 43 aero engines 43 airframe avionics 43 Multi Role Tanker 43 turbine blades 43 CFM International 43 ATR# #s 43 reverse thruster 43 A# XWB #s 43 incorrect airspeed indications 43 BOC Aviation 43 B# Dreamliners 43 AAIU 43 Bombardier CSeries 43 Europrop 43 longerons 43 GE CF6 engines 43 Advantage# 43 Embraer Phenom 43 trainer AJT 43 RTM# 43 A# XWB aircraft 43 A# MRTTs 43 EAD.PA 43 A# freighters 43 & Whitney PurePower 43 Liz Landau 43 V# A5 engines 43 A# superjumbo jet 43 shp 43 GP# [003] 43 QF# [001] 43 winglets 43 Airbus A# #s 43 ADIRUs 43 twin engined aircraft 43 #ERs Extended Range 43 BoeingBoeing 43 Hawk AJT 43 PT6 engine 43 turbojets 43 turbine 43 FlyDubai 43 Eurojet EJ# 43 Trent XWB engine 42 A# MSN# 42 replacing Pitot tubes 42 Dreamlifter 42 flammable insulation 42 pitot 42 Thrust Reverser 42 PT6A 42 #E# jetliners 42 CorporateCare ® 42 Europrop International 42 Boeing #-# Dreamliners 42 XWB aircraft 42 Airbus A# Superjumbo 42 Cessna Citation Sovereign 42 regional turboprops 42 Embraer Lineage 42 #LL [001] 42 provides IFEC 42 seat CRJ #s 42 wing spars 42 Boeing B# 42 depressurisation 42 seat Bombardier CRJ 42 Falcon #EX EASy [001] 42 Rolls Royce plc 42 Williams FJ# 42 airframe manufacturers 42 improper fasteners 42 Eurofighter Typhoon jets 42 Avro RJ# [002] 42 Airbus A# airliners 42 Cormorant helicopters 42 jet engines 42 Millimeter sized 42 Hawker #XPs 42 blended winglets 42 enginemaker 42 turbine rotors 42 nosewheel 42 airworthy 42 Hamilton Sundstrand APS 42 F/A-# Raptor 42 Those vibrations conceivably 42 Boeing #NG 42 PW# [001] 42 Q# NextGen 42 PW#A 42 #EX [002] 42 Bombardier CSeries aircraft 42 Beech #D 42 multinational aero 42 Cessna Skymaster 42 BK# [003] 42 jets 42 C #J aircraft 42 Airbus A#/A# 42 superjumbo A#s 42 vertical tail fin 42 widebody jets 42 airliners 42 Garmin G# integrated 42 Gulfstream GV 42 StandardAero 42 fuel inerting 42 Qantas Airways QAN.AX 42 MD#s 42 Dreamliner jets 42 Boeing #-# Freighters 42 PW#G Engine 42 twin engined plane 42 Superjets 42 Bombardier CRJ# jets 42 Thales tubes 42 CRJ# regional [001] 42 B# Dreamliner 42 De Havilland Comet 42 Boeing 42 double decker superjumbo 42 SaM# engine 42 TP# D6 42 Nimrod spy 42 Airbus A# XWB 42 Singapore Airlines 42 engine nacelles 42 spokeswoman MaryAnne Greczyn 42 #-# Freighters [001] 42 lightweight composites 42 PW# PW# [001] 42 Quantas 42 RJ# [002] 42 twin turbo prop 42 rotor blades 42 jackscrews 42 Tu #B 42 ATR turboprops 42 cabin pressurisation 42 engine turbo prop 42 A# NEO 42 engine thrust reversers 42 AW# helicopter 42 HC #J 42 CF6 #C# engine 42 ExecuJet Aviation 42 Itek Air 42 CFM# powered 42 tailcone 42 Eurofighters 42 dreamliner 41 Airbus ABI.YY 41 Next Generation #s 41 flagship A# superjumbo 41 Raytheon Beech #D 41 replacing Thales Pitots 41 EC# helicopters 41 freighter conversions 41 Flightglobal ACAS database 41 inerting systems 41 A# #E 41 ACJs 41 carrier TAM Linhas 41 narrowbody 41 seater Airbus A# 41 Airbus A# XWB twinjets 41 Airbus SAS A# superjumbo 41 Cessna #s 41 Ameco Beijing 41 Falcon #EX [002] 41 twin engined turboprop 41 Arrius #B# 41 A#Ms 41 Lancair Columbia 41 Gulfstream G# 41 seater Jetstream 41 re engining 41 QF2 41 Q# turboprop airliners 41 aircrafts 41 turbo propeller 41 Airbus ACJ 41 QAN AU Australia 41 GECAS 41 spokesman Nicholas Ionides 41 SkyCatcher 41 Phenom #s 41 ATR #-# turboprops 41 emergency airworthiness directive 41 GEnx 2B engine 41 BAe #s 41 seat CRJ# [002] 41 F 5E 41 hydraulics 41 PurePower 41 deepwater wells 41 seat ARJ# 41 & Whitney F# 41 Northrop EADS tanker 41 Yemenia jet 41 airbuses 41 Kaveri engine 41 Aero Engine 41 GE IN# 41 LEAP X1C engine 41 Sikorsky S# helicopters 41 International Aero Engines 41 Barbara Kracht 41 King Air B#GT 41 #-# Dreamliner 41 CIT Aerospace 41 Airbus A# jets 41 AIRSHOW Airbus 41 SPn 41 birdstrike 41 Manaus Aerotaxi 41 GE# [003] 41 A# Superjumbo 41 TFE# 41 CRJ# NextGen [002] 41 piston engine 41 flap actuators 41 Airbus A# jumbo jets 41 BBA Aviation 41 Blowout Preventer 41 Mirabel Aerospace Centre 41 turbojet 41 Boeing #-#/# 41 CJ1 + 41 deepwater drilling rigs 41 #Fs [001] 41 F #B STOVL 41 Vector Aerospace 41 proposed #E# jetliner 41 twin aisle 41 plane nosewheel 41 STOVL variant 41 Qantas Airways Ltd QAN.AX 41 compressor blades 41 Eurofighter Typhoons 41 Air Accidents Investigation 41 jumbo jets 41 GP# engine 41 CRJ#s 41 ALAFCO 41 #-# Intercontinental passenger 41 FADEC equipped 41 Sharklets 41 Q# NextGen airliners 41 ignition coil 41 Embraer EMB 41 PW#G engine 41 AE #C# 41 #-# Combis 41 Beech Baron 41 RYCEY.PK 41 Regional Jet MRJ 41 propeller shafts 41 ETOPS 41 Pitot malfunction 41 Citation CJ2 + 41 PurePower PW#G 41 breathing apparatus wearers 41 8Fs 41 RB# engine 41 Minotaur IV rocket 41 angled tail fins 41 SB2C Helldiver 41 flight LH# 41 Freighter Aircraft 41 Nikmatullah 41 aborted takeoffs 41 A#B# 41 Global Express XRS 41 longeron 41 Raytheon Hawker #XP 41 EC#s 41 Qantas Airways Ltd 41 Flight EK# 41 A#Fs 41 DeHavilland Twin Otter 41 B# #LR 41 flight AF# 41 narrowbody aircraft 41 corroded pipe 41 Russia S7 Airlines 41 Bombardier CRJ# [001] 41 Ozjet 40 Embraer 40 Acela trains 40 Canadair Regional Jets 40 pitot tube 40 UTX Quote Chart 40 Airbus narrowbodies 40 Harry Stonecipher 40 Embraer #s 40 CRJ# NextGen [001] 40 Lori Gunter 40 Turbomeca 40 widebody planes 40 A#neos 40 #-# freighter 40 A# jumbo jet 40 Q# turboprop aircraft 40 Qantas Airways 40 Systems Nasdaq AONE 40 Fokker #s 40 Boeing Co BA.N 40 turbo prop 40 #-# freighters [001] 40 Geared Turbofan TM 40 GP# powered A# 40 Sheriff Gary Ringhofer 40 Loretta Gunter 40 Avro jets 40 #ER freighters 40 defunct Vasp airline 40 tail rotor 40 cowling 40 Airbus A# jetliner 40 Paccar MX 40 hose reel jets 40 twin engined jet 40 Bombardier CRJ#s 40 scissor lift serviced 40 CEO Emirsyah Satar 40 Simon Rushton 40 Airbus A#M 40 Carcaillet 40 Boeing #NG aircraft 40 Airworthiness Directives 40 Citation Mustang 40 A# #Fs 40 twin engine 40 fuselage rupture 40 nacelles 40 turbojet engines 40 fuel injector 40 engine nacelle 40 FFS X 40 Boeing #-# Freighter 40 Hawker #XP 40 Boeing B# Dreamliner 40 Flight JK# 40 KC #Rs 40 V# Engines 40 pitot problems 40 Shenyang Aircraft Corp. 40 cryogenic engine 40 FlightGlobal website 40 rig blowout preventer 40 DA# NG 40 Extended Range aircraft 40 de Aeronautica SA 40 Adour engine 40 air bag inflators 40 Klaus Heinemann 40 CSeries jetliners 40 Afriqiyah 40 Singapore Aircraft Leasing 40 seat Q# turboprop 40 Spanair jet 40 Qatar Airways 40 CRJ# airliner 40 P 8As 40 manufacturer Airbus Industrie 40 rudder limiter 40 centrifugal compressor 40 Globemaster III airlifters 40 Sikorsky S# 40 SaM# 40 Hamilton Sundstrand subsidiary 40 Eurofighter Typhoon jet 40 Oshkosh AirVenture 40 Saab turboprops 40 CH #D 40 Bombardier Q# turboprops 40 A#/A# Family 40 Aeronautica SA NYSE 40 spokesman Thomas Jachnow 40 wing slat 40 turboprop airliners 40 twin engined 40 B 2s 40 Transocean blowout preventer 40 turboprop 40 winglet 40 #ER freighter 40 Services GECAS 40 Brazil Embraer EMBR3.SA 40 Shenyang Aircraft 40 Airbus A#s A#s 40 Q# airliner 40 ash ingestion 40 #ER Extended Range 40 Eurocopter EC# 40 GEnx 1B engine 40 airbus 40 Sandy Angers 40 airframers 40 CFMI 40 A# widebody 40 embeddable workflow 40 Bombardier Inc BBDb.TO 40 Q# NextGen aircraft 40 seat CRJ# [001] 40 CTOL 40 Boeing Dreamlifter 40 Aircraft Engines 40 Boeing #E# 40 Sikorsky CH #E 40 rival Airbus EAD.PA 40 OzJet 40 ROLLS ROYCE 40 Bombardier DHC8 40 Rolls Royce Merlin 40 airline S7 40 widebody #s 40 turbopumps 40 scramjet engine 40 Citation Excel 40 Citation CJ4 40 jet 40 Tam Linhas Aereas 40 widebody Airbus A# 40 spokeswoman Liz Verdier 40 Twin Otter 40 AESA radar 40 turbo props 40 #BCF 40 Cessna SkyCatcher 40 Ilyushin Il 40 F/A-#s 40 widebody Challenger 40 engine turboprop aircraft 40 GE# #B powered 40 FFSs 40 CFM# 7B powered 40 MRA4 40 autothrottle 40 CFM# 5B powered 40 ERJ.N 40 Qantas Airways Ltd. 40 A# Koala 40 designated ZA# 40 al Wazeer 40 Yvonne Leach 40 Pitot probes 40 Australia Qantas Airways 40 Chinook CH 39 powerplant 39 Nextant 39 CJ3 39 #NXT 39 #-# Intercontinentals 39 SGPJF 39 spokesman Jeremie Teahan 39 Citation CJ1 + 39 aft fuselage 39 European planemaker Airbus 39 CRJ# NextGen aircraft [001] 39 MD #N 39 pitot probe 39 secretary Steve Purvinas 39 partial midair breakup 39 Messier Bugatti 39 flightworthy 39 hydraulic pump 39 Turbo Mallard 39 B# NG 39 Air Niugini 39 magnetos 39 powerful explosive PETN 39 F# PW 39 Embraer E# 39 titanium studs 39 PT6 39 Canada PW#A engines 39 MiG #Ks 39 Tinseth 39 gearboxes 39 turbo prop plane 39 Rolls Royce RYCEY.PK 39 QF# [003] 39 coker drums 39 EcoPower engine wash 39 Maggie Bergsma 39 Tu #M 39 Ltd. AIR.NZ 39 Airbus A# A# 39 www.cessna.com 39 super jumbo 39 rudder 39 Blowout preventer 39 Concorde supersonic airliners 39 Merlin 1C 39 A# #F freighters 39 rotor rotary 39 PT6A engines 39 airplanes 39 Bombardier Cessna Dassault 39 General Electric GENX 39 Eurocopter AS#B# 39 LHTEC 39 NH#s 39 tail rotor blades 39 Panasonic eFX 39 Bombardier CRJ #s 39 Tamboen promised 39 #XP [002] 39 Eurofighter Typhoon 39 Hercules transports 39 CH #Fs 39 fuel tank inerting 39 GKN PLC 39 de Havilland Comet 39 V# SelectOne 39 Liberian flagged MV Biscaglia 39 RR.L 39 wing flaps 39 Qantas flight QF# [002] 39 Embraer SA 39 Laval Québec Canada 39 Olivia Wirth 39 Cobham Plc 39 giant #-# freighter 39 Chief Executive Steven Udvar 39 De Havilland Twin Otter 39 Wedgetail aircraft 39 GE Aviation 39 A# aircrafts 39 SR Technics 39 cabin pressurization 39 Filton Bristol 39 Tupolev Tu #M 39 KC #s 39 widebody airliner 39 Pilatus PC# 39 STOVL aircraft 39 Deepwater Horizon blowout preventer 39 Embraer E#s 39 Fokker F 39 EFP weapon 39 Emirates flight EK# 39 Citation XLS 39 Julien Gourguechon 39 Canadair CL 39 Marine Corps CH #E 39 Singapore Airlines SIAL.SI 39 #E# Dreamliners 39 DASSAULT AVIATION 39 Alteon Training 39 Jetliners 39 WK2 39 #E# Dreamliner passenger 39 EVERETT Wash. Boeing 39 SB2C Helldiver crashed 39 V# SelectOne TM 39 PTTEP Australasia 39 pitot tubes 39 Williams FJ# 3AP 39 blowout preventer BOP 39 Jacques Rosay 39 #-# Freighter [002] 39 Dash #-# 39 Boeing #Fs 39 Naverus 39 Jet Flys Away 39 seat Cirrus SR# 39 gaseous hydrogen leak 39 #-# Freighter [001] 39 AW# [001] 39 widebody jetliners 39 #ER planes 39 aicraft 39 Mirage fighter jets 39 turbocharged engines 39 Global XRS 39 QF1 39 AJTs 39 AerCap Holdings 39 CF# [001] 39 regional Kogalymavia airline 39 C#s [002] 39 rotor 39 Jay McClennen 39 Tassili Airlines 39 malfunctioning kiosks 39 COMAC 39 Cessna airplanes 39 F/A-# Hornet aircraft 39 F/A-#F Super Hornets 39 Gustav Humbert 39 aircarft 39 Kokoda airstrip 39 Sukhoi SuperJet 39 Bombardier Q# turboprop