Have been using the Bose QC 15 with a uflymike TSO version on the A320, as well as the A20 and the ProFlight. The companies i did and do fly for never had a problem with that, in fact the current one even has a cooperation with Bose for both the A20 and ProFlight at a significant rebate and even gives them out as prizes at internal events. All of those are battery powered, on unpowered XLR sockets, well, in the last airline it was the old style 2 pin socket, but that worked just as well.