“Why not just rent a car for the employees?”
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First answer: Union rules
Second answer: Union rules means they are then on-duty, have to be paid, and the FAA duty-hours clock is running
Third answer: Time of arrival in Louisville would mean not enough resting hours left for the planned duty day the following day - FAA rules.
United could have rented a limo for the employees traveling to Louisville.
Starting the CEO the United organization seems to have a jackboot mentality.