Air arrival (10)
I believe the answer is:
appearance
I believe this is a double definition.
'air' is the first definition.
(I've seen this before)
'arrival' is the second definition.
(I know that appearance is a type of arrival)
(Other definitions for appearance that I've seen before include "show" , "it seems" , "Look; impression given" , "Outward look" , "Act of being present - look" .)