Southwest is now the only U.S. airline that offers at least one free baggage check in for all passengers.
On Wednesday, JetBlue announced its passengers buying the cheapest level of tickets will now be charged a baggage fee. The airline says the new policy will generate $200 million a year.
JetBlue also announced that it is cutting legroom by 1.6 inches. That will allow it to add 15 seats to most of its fleet.
Southwest's "bags fly free" policy allows for up to two checked bags for free with weight limitations.