25 C.F.R. § 39.702
Can a school receive funds to transport residential students using commercial transportation?
A school transporting students by commercial bus, train, airplane, or other commercial modes of transportation will be funded at the cost of the commercial ticket for:
(a) The trip from home to school in the Fall;
(b) The round-trip return home at Christmas; and
(c) The return trip home at the end of the school year.