| ASK | Available seat kilometres; number of seats available for sale, per flight segment, multiplied by the number of kilometres flown on a flight; often a measure of an airline's performance capacity. |
| block hours | The time during which an aircraft is in revenue service. Calculated from gate departure (push-back) before take-off to standstill at the gate following landing. |
| Dry Lease | Leasing of an aircraft without personnel. |
| Flag-Carrier | National airline, either currently or in the past government owned or under government control. The term "legacy carrier" is also used. |
| Frills | Frills are free and / or additional services provided in connection with the flight. |
| IATA | International Air Transport Association |
| Low-Cost-Carrier | Also referred to as Low-Fare-Carrier, which is based on reducing all kind of complexity costs to offer tickets for a much lower price. |
| Passenger load factor | Percentage value to indicate the utilisation of an aircraft or an entire fleet within a certain time period, either on a route or within a route network. Represents the ratio of the revenue passenger kilometres (RPK) to the available seat kilometres (ASK). |
| Pax | Passenger |
| RPK | Revenue passenger kilometres. Number of passengers multiplied by the number of kilometres they cover in flight. |
| Slot | Time frame within which an airline can use an airport for take-off or landing. |
| Wet Lease | Leasing an aircraft including personnel. |
| Yield | Average revenues. Average turnover per selected output unit. The unit could be a single passenger, a single kilometre flown, or the passenger kilometres. |
| Yield-Management | Price management system to increase average earnings. |
