KLM Royal Dutch Airlines (in full: Koninklijke Luchtvaart Maatschappij, literally Royal Aviation Company; usual English: Royal Dutch Airlines) is a subsidiary of Air France-KLM. Before its merger with Air France, KLM was the national airline of the Netherlands. KLM is the oldest carrier in the world.

KLM stands for Keystroke-Level Model, a hard science approach to human computer interaction, based on GOMS, developed by Card, Moran & Newell, and spelled out in their book The Psychology of Human Computer Interaction, 1983.

A form of HRPT record.