When air travel is considered to be the most economical means of travel, a traveler is expected to use commercial (not private) airlines, unless another method of travel is clearly shown to be more economical and meets the mutual, reasonable needs of the university and the traveler.
Tickets can be purchased through the Concur booking tool, Southwest Airlines Corporate Travel, or other travel booking sources.
Per the University of Nebraska Travel Policy:
Travelers wishing to purchase and make their own domestic air travel arrangements outside the University-contracted travel management company must submit proof of comparable, less expensive airfare (including all airfare-related fees, such as taxes, airport fees, ticket refundability, University-contracted travel management company fees, baggage fees, or other costs impacting the comparison) from a reputable travel booking site and notes the source of funding to be used for the booking.
These comparisons must be completed on the same day to ensure price accuracy. Other University-contracted booking agencies may be used by the traveler and do not require proof of comparable, less expensive airfare.