Uhh, maybe try the following:
Problem 1:
Make a trigger that covers the airfield and set it to west present (or whatever side the stealer is on)
Then, in the condition field, type:
player in thislist and player in TankName
Where TankName is the name of the T-90
Problem 2:
Put the following in the condition field of a trigger:
Not alive TankName
Where TankName is the name of the T-90
-Student Pilot