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No, a pocket knife is not allowed in carry-on luggage in the U.S.; pack it in checked baggage and sheath or wrap it to avoid injury.

Yes, a pocket knife can go in checked luggage; pack it sheathed and follow airline and country rules.

No, planes don’t take off into a thunderstorm; crews hold or reroute until wind shear, lightning, and heavy rain hazards near the runway clear.

Yes, a PS4 may go in checked luggage if powered off, padded, and with controllers and spare lithium batteries in your carry-on.

Yes, a plane can land in the snow when runway friction, visibility, and crosswind stay within published minima and the airport keeps surfaces clear.

No—airlines usually delay or cancel takeoffs in a tropical storm unless winds, visibility, and wind-shear risks fall within strict safety limits.

Yes, if winds stay within aircraft, runway, and airline limits; headwind helps, while crosswind and tailwind set go/no-go and technique.

Yes, airplanes can take off in wind; pilots prefer headwinds, and each aircraft has crosswind and tailwind limits beyond which takeoffs pause.

Yes, planes can take off in a snowstorm when runway friction, visibility, winds, and de-icing meet strict limits set by regulators and airlines.

No, a normal airplane can’t stay still in the air; it needs airspeed over the wings, though a strong headwind can make its groundspeed read zero.