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But one couple had a different experience. Pushed along in the wheelchairs each airline provides by request, they whizzed past the line to a specially designated and briskly efficient Transportation Security Administration screener. Once cleared, the woman suddenly sprang up from her wheelchair, hoisted two huge carry-on bags from the magnetometer’s conveyor belt and plopped back in the wheelchair. She gave a nod to the person pushing her, and they rolled off to the gate.

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So it may be an expected, if uncomfortable, fact that some travelers appear to exploit perhaps the only remaining loophole to a breezy airport experience — the line-cutting privileges given to people who request airport wheelchairs, for which no proof of a disability is required.

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Identifying abuse is difficult, because not all disabilities are visible. Some older passengers who are able to walk short distances, for example, may not be able to stand for the long periods sometimes required in security lines.

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