While there are similarities between domestic and international flights, the rules for luggage can differ significantly.

Delta Comfort Plus seats have up to three extra inches of legroom and a better chance of snagging overhead baggage space ... checked bag on eligible international flights, like those to Europe ...

While carry-on weight limits vary by airline, most domestic U.S. carriers—such as JetBlue, Southwest, Alaska Airlines, and Delta ... in mind that international airlines and flights may have ...