If anyone can find me a comic, cartoon or toy from the original iteration of Transformers where the Decepticon Strike Planes are called seekers, I shall concede the point.
They're called Seekers all over the place in IDW. Especially when dealing with Thundercracker. From the wiki:
The word "Seeker" hovered a long time in a strange gray area between official and fan-coined terms. It seems to have originated in extremely obscure official or semi-official writing, but somehow became widely used among fans. (See below.) In 2002, the term appeared in dialog from the first issue of The War Within from Dreamwave Productions, making it truly official after years of controversy. It has subsequently appeared in many other places such as on toy packaging, books, and in other stories.
Yes, they do. Not in the original and definitive pre-Beast Wars TFs franchise, but in the only other incarnation of TFs to match the original franchise in success terms, the LIVE-ACTION MOVIE UNIVERSE. In "Revenge of the Fallen" Seekers exist, but do not refer to Starscream's air force, but rather Jetfire and the other old-fashioned TFs seeking the Matrix of Leadership. If Seekers means anything in Transformers, it means them!
Which, whilst fairly generic, could be argued to be slightly more accurate - given that Starscream et al always seem to be depicted as single-seaters, meaning they are A or C model F-15s, which are pure air superiority aircraft, rather than the two-seat F-15E Strike Eagles... :-)