TSA Liquid Rules: The 3-1-1 Rule, Exceptions and Duty-Free
How the TSA 3-1-1 liquids rule works for carry-on bags, which items are exempt, and how duty-free bottles and medications are handled at security.
Category: Flights and Airports
Refunds, ID rules and trusted traveler programs.
TSA PreCheck, Global Entry, NEXUS or SENTRI: Which One Fits Your Trips
How TSA PreCheck, Global Entry, NEXUS and SENTRI compare on cost, coverage and application steps, plus the free Mobile Passport Control app.
REAL ID and Airport ID: What TSA Accepts, and the $45 ConfirmID Option
What ID you need at TSA checkpoints since REAL ID enforcement began, accepted alternatives, the $45 ConfirmID fee since 2026 and rules for kids.
Airline Refunds in the U.S.: When You Get Your Money Back Automatically
The DOT rules on automatic refunds for canceled and significantly changed flights, delayed bags and unused extras, plus the 24-hour booking rule.