The GTFM policy for air/rail travel clarifies the policy related to approvals of long flight segments. Specifically, long flight segments (i.e. exceeding 6 hours in duration) require written approval prior to the travel booking by the head of the unit (principal, dean, director, chair or senior executive) OR one-up approval if the traveler is the head of the unit if the flight expense is being reimbursed from a source other than a research grant.
Examples of non-research funds that apply:
If the expense is being reimbursed from a research grant, then the sponsor’s applicable travel policy would apply.