Because an entity as big as ALPA is often interested in certain things that go beyond the individual needs of one specific airline. Now at ALPA, Delta and United are the big fish and they set a lot of the tone. So it’s safe to assume that if American were part of ALPA its needs would be prominent. But nothing changes the fact that as APA, the needs of your pilots and your airline are heard and catered to individually. Sure you may pay for certain services or what have you through ALPA National, but in the end your representatives represent you. No one else.