What counts as a 'bomber' in strike?

[play2often]

i'm pretty sure the il-2 is a bomber since it appears as a triangle, but then again it's taking a suspiciously long time to unlock the b-17. i've allready gotten the trophy for winning 50 strike games, but 10 of those were in a 109 (to unlock he-111 h3), but i got tired of using heavy bombers so i'm using the il-2 (not the il-2m, just single seat il-2, to avoid confusion) but i still haven't gotten the b-17. so either i'm on the verge of getting it, or the il-2 somehow isn't a bomber, or maybe i'm just losing my mind from playing toooo many strike games......