KMC has a 727-200 at 1/72. This model comes with the American Airlines decals. Even in Belgium, I saw this model at two different stores, so in the United States you should not have a problem finding it, or at least be able to order it from a supplier.
Yes I know Heller has a 707 at 1/72. It comes with the old Air France decals.
The problem with those models, although they may be great to look at, is where to put them at home once they are finished.