I was told by my AL DM that when you fly at the end of your turn you must return to the ground or at the end of the round take falling damage.
I can't find this rule set anywhere. All I can find is:
Races that have Flying at level 1 are illegal for AL play. (ALPG, p.3)
And from Sage Advice (twitter):
Can a flying creature without the hover trait stay in one place while airborne, or does it need to move each round?
A flyer that lacks the hover trait can stay aloft with-out moving each round.
Which seems to contradict his answer.
Any guidance would be appreciated.