Thanks so much ( don't stop weighing in please) ..... for the A20, please correct me....From what I have read,,, you can set up Bluetooth with the iPad for Foreflight, as well as timer apps etc, and you can also set up a smartphone for calls on the ground,, both ( 2 Bluetooth devices ) at the same time.. is that true?? Please see below from a website Q&A :
================================================== Q&A
Can I listen to music with my Bose A20?
Yes, all Bose A20 headsets allow you to connect to your smartphone or MP3 player via a 3.5mm patch cable (included) or via Bluetooth on the Bluetooth model (new in July 2015!). It can also connect to other devices such as a GPS or traffic warning system. An Audio Priority switch on the A20 allows you to control if/when external audio will cutout during an ATC transmission. The A20 headset also has other Bluetooth profiles, including hands-free calling and multi-point, which allows you to connect to more than one wireless device simultaneously.