Can I use Air Display on multiple iOS devices at the same time? I use Air Display to convert my iPad in to an extra monitor when I'm not using it.  However, I have other iOS devices lying around, too.  Is it possible to use Air Display to turn multiple iOS devices in to extra monitors at the same time?
Question: "is it possible to use Air Display with more than one Ipad?”

Answer: "We only support one iPad at a time currently. We've talked about supporting multiple iPads at once and that may be something we support in the future. For now, we're sticking with one iPad. “

Source: Air Display Support Forum