How will the new 3-1-1 rules affect U.S. arrivals?

What travelers need to do now

A new set of "3-1-1" rules has been announced for international flights arriving in the United States. The change refocuses how liquids, gels and aerosols in carry-on bags are screened at U.S. entry points and means passengers should review packing plans before departure.

At the core, the update affects the way liquid items are presented and inspected at security checkpoints and on some inbound flights. While specifics about allowed volumes and packaging vary by airline and by checkpoint, the practical impact is immediate: travelers risk delays at security, additional screening of carry-on items, and in some cases being asked to check items they had planned to carry onboard.

What sensible steps to take

• Check official guidance from your airline and the Transportation Security Administration (TSA) in the days before flying. Rules for international arrivals can differ from domestic policies.
• Pack liquids in transparent, resealable quart-sized bags and group them for easy inspection to speed up the screening process.
• Consider placing larger toiletries in checked luggage when possible to avoid being denied carriage at the gate.
• Allow extra time at the airport; expect additional screening to add minutes, sometimes longer, to the security process.
• Keep receipts or proof for duty-free purchases and be prepared to show them.

Why it matters

For many international travelers, carry-on planning is a routine part of the trip. This update raises the stakes: a minor packing mistake could mean missed connections, longer waits at busy checkpoints, or last-minute baggage changes. Travelers on tight itineraries—short international connections, multi-leg itineraries to remote destinations, or trips timed to events—should add extra buffer time and confirm rules directly with carriers and airport authorities before leaving home.