why delete the most exotic and most historical planes in AH?? the jet rides are great fun, and the p40b and p51b were both very important. infact, the p51b is a real monster. it's faster than the D pony at some altitudes, climbs better, and is more maneuverable. the only thing the D pony has on the B is an extra pair of guns. the boston was an important bomber in the earlier years of british bomber command. it led some of the first lightning raids into france to deal with the luftwaffe after the BoB. it's also an excellent performer... it's very fast (outruns some fighters), carries a decent bombload, and climbs faster then the p47s f4us etc.
give them all a try!
why delete planes, when we could just add more? no reason why the planes you listed can't be added in their own right, without deleting any other planes.