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Yes, a shaver can go in a carry-on—electric shavers and disposable razors are fine, but loose blades or a loaded safety razor must ride in checked bags.

Yes — on most trips, you can add a checked bag after online check-in with American Airlines in the app, under My Trips on aa.com, or at a kiosk.

No—on most airlines a snowboard exceeds carry-on size, so pack it as checked baggage; TSA permits snowboards, but the airline’s limits control.

Yes — United lets you add a checked bag online, in app, at kiosks, or at the counter; fees vary by route, fare, and status.

Yes, a Swiss Army Knife can go in checked luggage; it’s banned in carry-ons; wrap or sheath the blade and follow local knife laws.

Yes — on British Airways, you can add baggage after check-in only at the airport at the standard airport rate; online adds must be done before check-in.

Yes, you can add baggage after booking with Jetstar, either online in Manage booking or at the airport, with prices lowest online and limits up to 40kg.

Yes, Delta lets you add a checked bag after online check-in via My Trips, the Fly Delta app, a kiosk, or a counter—standard bag fees apply.

Yes, Wizz Air lets you add baggage after booking in Manage Booking up to 3 hours before departure; prices are lower online than at the airport.

Yes, a police officer can check your bag in the U.S. with consent, a valid warrant, probable cause, or when a narrow legal exception applies.