Major U.S. airlines have increased checked baggage fees over the past week, citing rising fuel costs. Alaska, American, Delta, JetBlue, Southwest, and United have all raised fees by $5 to $10 for first and second bags, with larger increases for additional bags. This is the first widespread increase since the pandemic, and these higher fees are likely to stick even when fuel costs inevitably decline again. If you regularly check bags, co-branded airline credit cards that include free checked bags have become more valuable.