ATPL fun

2. – The ratio of True Airspeed to the Local Speed of Sound.
8. – A measure of a fuel's resistance to "knocking" or detonation.
9. – The 1944 Convention that established ICAO.
14. – A routine aerodrome weather report.
16. – The vertical distance of a point on the Earth's surface above MSL.
18. – The upward angle of the wings from the fuselage to increase lateral stability.
19. – The tube used to measure dynamic pressure for the airspeed indicator.

1. – To select a specific code on the transponder.
3. – A state of oxygen deficiency in the body.
4. – The boundary between the troposphere and the stratosphere.
5. – A sudden reduction in lift caused by exceeding the critical angle of attack.
6. – (Tricky one!) Actually, let's go with GNSS: Global Navigation Satellite System.
7. – Altimeter setting that provides altitude above Mean Sea Level.
10. – A line on a weather map connecting points of equal atmospheric pressure.
11. – A line on the Earth's surface that crosses all meridians at the same angle.
12. – Reference landing speed, typically 1.3 \times V_{S0}.
13. – A notice containing information concerning the establishment, condition, or change in any aeronautical facility.
15. – The cockpit instrument used to display the bearing to an NDB.
17. – Prefix related to wind (e.g., the instrument used to measure wind speed).
19. – Performance Based Navigation; the modern standard for area navigation (RNAV/RNP).