Frontier Airlines announced on Tuesday that it would fly your bags for free on select flights in an effort to be your “rebound” if you’ve been scarred by the end of Southwest’s policy. Here’s how it works.

Frontier Airlines on Tuesday unveiled a free bag check promotion in a dig at Southwest, exactly one week after the rival budget carrier ended its own decades-old policy.

The changes include bag charges, more restrictions and fewer points for basic economy, expiration dates on credits, and dynamic pricing for point purchases.