Yes, most major full-service airlines in 2026 allow same-day standby, though the rules have become more restrictive. Southwest Airlines is a leader in this area, offering free same-day standby to all passengers, including those on "Wanna Get Away" fares, provided there is a seat available. United, Delta, and American Airlines also offer standby, but it is typically "complimentary" only for elite status members or those with flexible/premium tickets; basic economy passengers are often excluded from standby lists. "Standby" means you are put on a waiting list for an earlier flight than the one you booked. If a seat opens up after all confirmed passengers have boarded, you are cleared. It is a great way to get home early, but it is never guaranteed, and checking a bag can often disqualify you from the standby list for logistics reasons.