"This is THE way to test your aviation knowledge."
Hehe, I think that test thingy is pretty far from that.

Didn't try the lower levels but even that "Very Hard" level is VERY easy IMO.
And it's true that this test doesn't know the designations of the planes it's asking.
For example only possible option of the four was Stratofreighter while tanker boom was clearly visible...so the plane was stratotanker.