I wish there was another answer to this question, which I see has been asked several times since 2014. Apple stopped making the airport express years ago. Recently I changed out my apple network for netgear and I’m reluctant to add back one of the old slow airport expresses in case it slows the whole network down. I could try it I guess but there is a lot of maintenance already.
Yet streaming airplay material from device to device is what happens all over the house right now,TVs, smart speakers, the big Marantz amp. Would like to be able to stream from the phone or whatever to the QuPac.