1. Is Doppler navigation still in use for civilian aircraft?
  2. Does windmill restart often work for airliner engines?
  3. How do pilots hold the runway centerline during takeoff?

  4. Is it illegal to partially block the aisle on a passenger airliner?
  5. What is the purpose of long endurance test flights?
  6. Why don't airliners use crescent wings?
  7. How much of an improvement would a 1% weight decrease on an airplane be to the industry?
  8. How A330-200 or 243 would be much safer under the ETOPS terms?

  9. Does a 40 years clean crashes sheet of airliner makes people fear to fly with them because there is bigger pressure on the company?

  10. Why is the Tu-144 the only commercial airplane with canard configuration?

  11. Why didn't the Boeing 757 share the 767 fuselage?

  12. Why is Emirates not considering buying or leasing used A380s?

  13. How hazardous is it if an engine cowl falls off?

  14. Why are modern commercial airplanes still so noisy?

  15. What system is used to drive the control surfaces of airliners?

  16. What is meant by a “cold soak" of an APU?

  17. Why do wings of passenger jet go dark during a flight?
  18. What happens at the wings when the yoke is pulled backwards?
  19. What is this device mounted on the fuselage of Lufthansa planes?

  20. Are new airliners less safe than older the two first years after they are marketed?
  21. How many Inertial Reference Systems are on a commercial aircraft?

  22. Could an aircraft like a Boeing 777 take off with flaps fully deployed?

  23. Why are winches not used for towing commercial planes up?

  24. Why do we never see high-bypass turbofan engines sharing the same nacelle on large airliners and similar aircraft?

  25. What's the appropriate course of action if an airliner bounces 5-10 feet on touchdown?
  26. How will the Boom SST not require an afterburner?

  27. Is there any kind of removable ELT on board an airliner?
  28. Is flying during the day safer than flying at night?

  29. What type of batteries are used in airline planes?
  30. Are sequenced waypoints still displayed on the Navigation Display / FMS legs page?
  31. What is the typical voltage used on jet airliners?
  32. Can large airliners do aerobatics such as loops?

  33. Why did my business class seat have a three point shoulder harness?
  34. What is the typical touchdown angle of a large airliner?
  35. What is the typical touchdown vertical speed of a large airliner?

  36. Is the air bleeded from the engine to maintain cabin pressure for airlines heated or cooled

  37. How does the weather radar work?

  38. Why do aircraft models end their life as freighters?

  39. What are these things hanging off the trailing edge of the wing?
  40. Can a human get sucked into a jet engine?
  41. How much does it cost to design a jetliner's wing?

  42. Is there any application where the crescent wing would be the best wing planform?
  43. What components of the Boeing 787 are made out of titanium?

  44. Would hydrogen fuel tanks on an airplane increase lift?
  45. What are the wings and fuselage of an airliner made of?

  46. What is the average weight difference between composite and metal airliners?

  47. Does cargo balance affect fuel efficiency in commercial aviation?

  48. What is the purpose exactly of a ‘Control Check’?

  49. What are the design parameters for airliner safety?
  50. Could supersonic transport make a comeback?

  51. Have we seen the last significant experiments in the configuration of jet airliners?

  52. Where is the fuel stored on an aircraft’s wing?
  53. What type is this aircraft and engine at Munich airport?
  54. Why don't airlines load their passengers like freight?

  55. Why are commercial airplanes painted at all?
  56. When a typical commercial airliner flies overhead, what is the actual noise we are hearing?
  57. What is the purpose of the little eyebrow windows on the Boeing 737?

  58. Do windows on the side of the fuselage increase drag?

  59. Do modern airliners have oxygen sensors in the cabin?
  60. How are electronic systems locked and connected in the electronic bay?
  61. Would titanium be a better option for aircraft skin if cost were not a factor?

  62. How common are diversions to high-latitude airports for intercontinental flights?
  63. What is the source for the flight data shown on in-flight entertainment systems?

  64. How much force are large aircraft brakes able to exert?

  65. What material is used to make engine covers for passenger airliners?

  66. What is the noise level inside the Tu 114 passenger cabin?

  67. Can an airliner land safely using only propulsion control?
  68. At which point does an airliner start to pressurize/depressurize the cabin?

  69. Where do flaps and elevators get input from?

  70. Why doesn't condensation form on the inside of airliner windows?

  71. Why were 'business jet' airliner designs so popular in the past?
  72. Are there big differences between Douglas Commercial 3 and Douglas Commercial 4?

  73. How does the raked wingtip of the Boeing 787 work?

  74. How do airliners get from the factory to the client if the aircraft does not have the required range?
  75. What throttle setting does an airliner use while cruising?

  76. What are the spiral marks in the center of the engines?
  77. Estimating the fuel required in terms of flying distance and total weight

  78. What is this orange container labeled "Flight kit wheel"?

  79. How do airlines without assigned seating verify cargo balance?
  80. Why aren't there V-tail airliners?
  81. Why do airlines not use direct routes?
  82. What are SIDS and STARs?
  83. Does EASA require airliners to be fitted with autopilots?
  84. Is there AOG liability?

  85. What is the purpose of the sharp pods under airliner wings?

  86. Do modern aircraft have sensors to determine weight of the aircraft?
  87. What is the drag induced by a high bypass jet engine on an airliner?

  88. Is more cargo loaded if there is less passengers than expected?

  89. Does the wifi uplink antenna affect aerodynamics or efficiency?

  90. Why don't airliners use noise cancelling?
  91. Is spin recovery possible in an airliner?
  92. Do airliners use light alloy wheels, like cars do?
  93. Can commercial airliners fly over central Antarctica during winter?

  94. Have there been any solo flights on airliners?

  95. Is water a possible fuel for jet engines?

  96. What are these circles below the wing?
  97. Why aren't there any single turbofan airliner?
  98. Do airliners perform a dive maneuver to reduce altitude
  99. How much air is recirculated (vs. bleed air injected) in modern airliners cabin?

  100. How are airliners secured on the ground during hurricanes?