Most airports have chapels where these terrorists could have prostrated themselves and prayed in private. The whole scene, I believe, was a set-up to "probe the lines" to see what kind of reaction they would get or to set in motion more of the cultural sensitivity training crap as supported by the ACLU.
The 911 hijackers also said prayers before and during the takeover of the planes......to hell with Muslims and their sympathizers.... ....