I've got all the loadouts for the IL10 so just assumed it was a screw up with the data, for example.... i've got the maximum wins for all the IL10 unlocks (40) so regardless of what it says i've actually got them all
Its other planes i dont have the loadouts for but to be honest it was an achievement/trophy that i wasnt to bothered about because i didnt want to play lots of games flying planes i really didnt want to fly lol.