I fly very often on EL AL and I always pray in my seat. I can't concentrate on prayers near a bathroom, with stewardesses and passengers passing through, and the difficulty of hearing the ba'al koreh. More than that, I don't understand those who pray Shacharit on the plane when we are landing at 7:00 am. Pray in the luggage hall. It's huge, and it's easy to find a quiet corner to pray.
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from the article: Finding a ‘makom’ to pray - 20,000 feet in the air