N389AZ made its first revenue flight today (6/8/19) under its new number in its new Amazon Air paint. CVG-DFW. https://flightaware.com/live/flight/N389AZ
The aircraft actually went into service post-conversion on 3/10/19 under a CAM tail number, N382CM (N930WE before that, after being acquired by 30 West from Air New Zealand; 30 West sold it to CAM, and CAM converted it.) Among other things, it subbed for N399CM on LAX-HNL while that aircraft was getting a maintenance check. Now it has been dry-leased to Amazon, and will be flown only on Amazon flights, and ATI is continuing to operate it.
Two more are close behind:
N730WE, to be N367AZ, is currently in paint at ROW. (Flew there straight from conversion, and has been there for 3 weeks, oddly. It's usually a very-reliable two weeks at Dean Baldwin Painting.) It will then go to ILN for conformity before going into service.
N373AA, to be N379AZ, is currently in paint at Dean Baldwin's facility at GUS. She has been there a week so should have about another week to go. That frame, like 382CM, is already on the ATI certificate, having finished conversion in late November 2018, and has been operating flights in grey paint applied in TLV over the primer, with the rudder still in AA colors, largely for UPS until recently. It will emerge in the Amazon Air livery. I would guess that this aircraft will actually go to Amazon sooner, as there is less to do to it at ILN when it's done with paint.
And a little side note: ATSG still has two routes for UPS: PHL-MCO and PHL-MIA. ATI was flying both initially with 767-300s. Then, PHL-MIA came off of ATI when 373AA came out of service for them and went to TPA for some work. That route went to ABX, which serviced it with a 767-200, while 376AN continued to fly PHL-MCO. As of the first week of June, 376AN came off of UPS to do spare/military work while the aircraft usually assigned to those duties, 395CM, is at ILN for maintenance. So the carriers switched. ATI is now flying the 767-200 route, PHL-MIA, with 255CM, and ABX is flying the 767-300 route, PHL-MCO, with recently-unemployed/underutilized 363CM.