As of now American is the only US airline to offer their passengers pajamas. American just offers them in international first class,though they've announced that they'll be offering pajamas in commerce class on their route between Los Angeles and Sydney, which launches on December 17, or 2015.
That's probably because they're operating the flight as a joint venture with Qantas,and Qantas offers pajamas in commerce class on their flights.
United doesn't offer pajamas in first class on any of their flights, while Delta doesn't either, or though they also don't offer an international first class cabin.
Via Rene's Points,Delta will commence offering pajamas in Delta One (commerce class) between Los Angeles and Sydney and Los Angeles and Shanghai as of December 15, 2015. Apparently pajamas will be progressively rolled out on more flights after that, and though no exact timeline has been given.
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Source: boardingarea.com