Jet Engine Technology

To Research Jet Engine Technology, you must have a level 10 Research Center, a level 1 Airport, a level 5 Training Technology, and a level 10 Fuel Engine Technology. The level of Jet Engine Technology increases the flight speed of your aircraft by 5% each level. 
Research is based on times with no Knowledge officer as your mayor.
Time to complete each level.
Level 1 - 10 minutes 56 seconds
Level 2 -