Delta raising cost to check a bag by 17% [Video]

SAN FRANCISCO — In case you needed yet another incentive to cram all your travel items into a carry-on, Delta Air Lines just boosted the cost of your first checked bag by 17%. The increase adds $5 to the previous, and not-exactly-insignificant, $30 fee for domestic flights.

Delta is the third major U.S. carrier to hike bag fees in the past several weeks. Its move follows similar increases that American Airlines and United Airlines announced in February, three days apart; those high fees themselves followed fee hikes by smaller carriers Alaska Airlines and JetBlue Airways. Major U.S. carriers often copy one another’s pricing changes, a move that behavior analysts sometimes refer to as herd instinct.

Delta said Tuesday that the first bag checked on a domestic flight will now incur a …