No, in 2026, Southwest Airlines still does not allow the use of flight credits or LUV Vouchers to pay for EarlyBird Check-In®. Flight credits are strictly reserved for the purchase of the "base fare" and associated taxes of a flight. To add EarlyBird Check-In—which automatically checks you in 36 hours before departure to secure a better boarding position—you must use a credit card or PayPal. This also applies to other "ancillary" fees like Upgraded Boarding at the gate, pet fares, or unaccompanied minor service charges. For 2026 travelers, a "pro-tip" to get this service for "free" is to use a Southwest Rapid Rewards® Priority or Performance Business Credit Card, which offers a limited number of reimbursed boarding upgrades or credits per year, effectively bypassing the restriction on using your existing flight credits for these premium add-ons.