U, u
UATP. Universal Air Travel Plan. See Air Travel Card.
UBOA. United Bus Owners of America.
UC. CRS. Unable to accept request (not waitlisted). See also US.
UCCCF. CRS. Universal credit card charge form.
U-drive. Brit. A rental car.
UFO. Abr. Unidentified flying object.
UFTAA. Universal Federation of Travel Agents Associations.
UK. Abr. United Kingdom.
UM. CRS. Unaccompanied minor.
UMNN. CRS. Unaccompanied minor, where NN denotes the child's age.
UMNR. CRS. Unaccompanied minor.
UN. 1. CRS. Unable. 2. Abr. United Nations.
UNA. CRS. Unable.
unaccompanied minor. A child traveling, usually on an airline, without a parent or other adult guardian.
unchecked baggage. Baggage which a traveler retains in his or her personal control. An important distinction when liability for loss or damage is to be determined. See also checked baggage.
undercurrent. See undertow.
underdeveloped. Not having a sufficiently modern infrastructure.
undertow. A dangerous coastal current that can drag swimmers out to sea.
undeveloped. Without amenities or infrastructure, as a camping area or tourist destination.
uninterrupted international air transportation. Any airline flight that does not include a schedule stop of more than twelve hours in the United States.
Union Jack. The flag of the United Kingdom.
Universal Air Travel Plan. See Air Travel Card.
Universal Time. See Greenwich Mean Time.
UNK. CRS. Unknown.
unlimited mileage. In a rental car, the absence of any per mile charge for miles driven.
unrestricted fare. A higher fare for a ticket offering maximum flexibility. Typically, unrestricted fares require no advance purchase, no Saturday night stay, no roundtrip purchase, and are fully refundable without penalty or fee.
unscheduled. Not on or according to a timetable.
unspoiled. Term used to describe tourist destinations that, in theory, have not been discovered by or overrun with tourists.
upgrade. 1. v. To move to the next higher category, as to upgrade a passenger from tourist to business class. 2. n. A coupon entitling someone to an upgrade. 3. n. The act of upgrading.
upper/lower. A designation indicating the use of bunk beds or berths, as in a ship's cabin or railway compartment.
upscale. Appealing to or designed for a more affluent clientele.
upwind. Toward the direction of the wind.
URL. Abr. Universal resource locator. The address of a web site (qv).
US. CRS. Unable to accept request (waitlisted). See also UC.
user-friendly. Designed in such a way as to be easy to use or operate, especially of computers and computer software.
U-shape setup. In a meeting, a configuration in which tables are formed in the shape of a U, with chairs on the outside of the U and the front of the room at the open end of the U.
USS. Abr. United States ship.
USTAR. United States Travel Agent Registry.
USTDC. United States Travel Data Center.
USTOA. United States Tour Operators Association.
USTS. United States Travel Service. Now USTTA (qv).
USTTA. United States Travel and Tourism Administration.
usury laws. Legislation restricting the amount of interest that may be charged.
UT. Universal Time.
UTC. 1. CRS. Unable to contact. 2. Abr. Coordinated universal time.
UTDN. Abr. Unattended ticket delivery network.
utilization rate. In the car rental industry, the percentage of vehicles in use during a specified period of time, figured on a system-wide or local basis.
UTR. CRS. Unable to reach.
UTV. Abr. Universal travel voucher.
UU. CRS. Unable