Of course...it’s possible!!! Ramming another jet that is airborne or on the ground, carrying regular bombs or explosives, carrying nuclear weapons, carrying poison gas cannisters or bio chemicals, flying into buildings, crashing into the ocean, crashing into land, holding passengers for ransom, etc., etc. Anything is possible.
IMHO, both Obama & his administration were asleep at the wheel on this one. The world is not safe these days...no matter where you are!!! The USA....thanks to Obama has no big stick anymore....Obama is the laughing stock of the world....and the folks that hate us are at will to do whatever they please.
Speaking of which, I think I recall reading a list of the nationalities of the passengers, and there were three (?) Americans. If so, have they been identified publicly?