An excellent answer from PP, as always!
I would add the following questions that come back regularly:
Describe final 200 ft of approach in a crosswind.
What happens at V1?
Why does the stalling speed change at altitude?
What is speed of sound at SL and 40,000?
What is the cruising speed of a B757 at 30,000ft?
What FL would you choose between London and Glasgow?
What provides lift?
What is MAC?
4 limiting factors in RTOW calculations?
... and all "rule of thumb" and "1 in 60" calculations.
MF