Mexico City-based VivaAerobus formally launched its fleet transition to A320 aircraft today, after the airline started operating its first three Airbus A320 aircraft in April. The low-cost carrier will receive an additional two A320s before the end of 2014.

While that’s down four percent from 2012’s total for baggage fees, it nonetheless represents more than a quarter of the airlines’ total profit in 2013 – which certainly explains why you’re paying for that second, third and fourth bag.

United Airlines today announced that it will introduce nonstop flights between its hub at Denver International Airport and Panama City beginning Dec. 3, subject to government approval with flights available for sale at a later date.

The three new destination represents JetBlue’s 52nd, 53rd and 54th nonstop routes out of Boston, and JetBlue will offer the only nonstop service between Boston and both Costa Rica and Saint Lucia.