I see many new USA based cities listed on the USA based qatarairways.com site for "Our latest flight deals..."
If my recollection is correct these new cities look familiar to a time when they were listed but never had possibilities of booking, San Francisco, Seattle, Minneapolis, Detroit and Seattle.
Clicking through a few showed some booking now possible traveling with AA ( including AA's regional airlines ) being the feeder to another QR departing point within the USA. This is the first time I have seen them use AA as a possibility.
QR has been using B6 for a while but noticed another new one today AS.