The way things are going in the airline industry, especially in U.S., there will not be any perks of frequent flyer programs nor on first & business class. Starting March 9, 2011, United Airlines is the first in line to do away with the $2 to $3 discount that passengers used to get if they paid for their luggage online instead of at the ticket counter. There’s no more incentive to prepay online for your checked bags if you’re flying United Continental.
The charge for domestic flights operated by United Continental Holdings Inc. is now $25 for the first bag and $35 for the second, no matter how or when you pay. United and Continental used to offer a $2 discount on the first bag and $3 off the second to encourage passengers to pay up before arriving at the airport.
American does not offer such incentives, Delta still offers a similar discount.
Southwest is the only airline to allow passengers to check two bags for free.