A soft drink is poured into a plastic cup of ice on a commercial airline flight in the US, July 15, 2008. Studies have shown that noise, low pressure, dry air, plastic cutlery and cups can alter the way we taste things at high altitude. Airlines are starting in earnest to tailor their offerings to account for those changes. (Ruth Fremson/The New York Times)

2 airlines will postpone serving
alcohol amid in-flight violence

American Airlines says alcohol will be served in the first class and business class, but only during the flight and not before departure