Can do
While water and beverages with electrolytes are strongly recommended on flights over carbonated beverages, if you’re really jonesing for that entire can of soda (not just what is placed in the little plastic cup), you can have it. Just ask politely! ‘The reason we pour it in a cup goes back to the old days of service,’ flight attendant Typhanie King told the Huffington Post. ‘It’s just good customer service to pour your drink in a cup. Many people prefer to drink out of a cup. But you can certainly ask for the entire can of pop.’
