Originally Posted by karthik
I have never flown on a carrier from a mostly Islamic country. I was under the impression that they displayed the compass heading to Mecca (sorry, don't recall what that's called or if that's even correct) on the overhead displays as well as unintrusively announced or showed prayer times.
A good number of carriers from muslim-majority countries don't display/announce anything special at all.
Originally Posted by karthik
If they do do this indeed, how do they deal with the time zone changes? Do they take the beginning or ending time zone, or do whatever they're over? It sounds like it could be very tricky. And if they don't do this at all, I wonder as to what sort of in-flight prayer info/announcements Islamic carriers do provide.
I would also assume that, as one of the previous posters said, other than during times like the Hajj most Muslims are more concerned with sleeping than observing every call to prayer while aboard a fast-moving vessel crossing timezones in a haphazard fashion.
But, I am curious how these carriers provide for what must be a large proportion of their customer base. And do they only serve halal food? I would assume so, even though I know a large number of them do serve alcohol even though devout Muslims would not be ordering it. (Kind of like how domestic Indian flights aren't allowed to serve alcohol... but they can do whatever they want to do on international flights.)
The food is usually halal, although there are some exceptions.
Observation of prayer times by individual muslim passengers is all over the board when it comes to traveling, especially travel over time zones. How airlines deal with it -- or don't -- is also all over the board, but most basically skip the matter. Also, Ramadan doesn't mean passengers will starve in-flight.

(I say that because if observation of prayer times was standardized in-flight, there'd be some food issues related to standardization of times too.)
Given this is Turkish Airlines, religion really does not come into play any more than it does for Lufthansa.