Through Dec. 30, Hilton HHonors members can earn Southwest Rapid Rewards double credit for stays at over 600 participating Hilton HHonors hotels.

Mention the “YY” plan code for Hilton, Hilton Garden Inn and Hilton Grand Vacations Club properties and the “YY1” plan code for Doubletree, Embassy Suites Hotels, Hampton Inn, Hampton Inn & Suites, and Homewood Suites by Hilton when making reservations.