Can one daven shacharis with talis and tefilin in the bathroom of an airplane?
it is prohibited to enter a bathroom with one’s tefillin. It is likewise improper to enter a bathroom with one’s talis. It is also prohibited to daven in the bathroom. Instead, In-flight minyanim involve several problems, and sometimes the best option is simply to daven in one’s seat.
Sources: Shulchan Aruch, Orach Chaim 40; Mishnah Berurah 21:14.