Consumers paid $1.3 billion to check bags in just the first three months of the year, but airfares are at an all-time low.
A recent study shows add-on pricing model may be bad for airlines.
The company allows up to 250 pounds of luggage, but riders bring even more aboard.
CEO Ben Baldanza talks about his airline's cheaper, stripped-down experience
And that's down from 2010.
