Reference
Aviation glossary
Concise definitions for aviation terminology — from METAR and NOTAM to aerodynamics and airline operations. Search directly or scan alphabetically.
U
Ultra-Low-Cost CarrierAn ultra-low-cost carrier (ULCC) is an airline that competes primarily on base ticket price by unbundling services and charging separately for baggage, seat selection, boarding priority, and other add-ons. Unit Load DeviceA Unit Load Device (ULD) is a standardized container or pallet that consolidates baggage and cargo into single units for efficient loading into aircraft cargo holds. ULDs lock into the aircraft floor and are tracked as reusable airline assets. Useful LoadUseful load is the total weight an aircraft can carry beyond its basic empty weight, including fuel, occupants, cargo, and baggage. It is calculated by subtracting basic empty weight from maximum gross weight.
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