Is unbuckling one's seat belt during a plane refueling a legal requirement, or an airline-specific regulation in the United States?

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During a plane refueling, passengers may be asked to unbuckle their seat belts (to be able leave promptly if the plane catches fire).
Is that a legal requirement that applies to all airlines, or an airline-specific regulation in the United States?
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Do you have to fasten seatbelt on plane?
Passengers are required by law to wear a seat belt on the plane unless the seatbelt sign is turned off. While you can buy your own seat belt extender, there is no guarantee that it will be allowed through security and there's no guarantee you will be able to use it on the plane.How do you unbuckle a seatbelt on a plane?
Flight attendants check that seatbelts are fastened the old fashioned way - by looking and confirming each passenger has correctly fastened them. There is no indicator anywhere around each seat which indicates as such.How to Properly Repair a Bent Wheel
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