As long as the total of reimbursements are less than 50% of the cost of
the flight, it doesn't conflict with the FARs. OTOH, if someone has a bug
up their posterior and wants to hassle you, they don't have to be right or
interpret the FARs correctly.

Neil

As long as their total contribution is not more than their pro rata share of
the cost of the flight.
50% if there is only one person going with you.. but the example was three
others.

B