The possible long-term health risks to airline personnel who repeatedly cross multiple time zones has been a concern since the first jet transports went into service in the 1950s.
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Awho repeatedly cross multiple time zones has been a concern since the first jet transports went
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Bwho are repeatedly crossing multiple time zones has been a concern since the first jet transports that went
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Cwho repeatedly cross multiple time zones have been a concern since the first jet transports went
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Drepeatedly crossing multiple time zones has been a concern since the first jet transports went
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Erepeatedly crossing multiple time zones have been a concern since the first jet transports going
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