3301 Travel on University Business | It’s Your Yale
https://your.yale.edu/policies-procedures/policies/3301-travel-university-business
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A. Exceptions
Business class may be used for travel if the relevant business office confirms before purchase that appropriate funds are available, and if any of the following conditions are met:
Any single flight segment has a scheduled in-air flying time in excess of six hours;
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University policy allows business class service on Amtrak and the Acela, not first-class service.
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