<P> Although used in the US, many countries do not permit LAHSO clearances, and some airlines' operating procedures do not allow their acceptance in countries that do permit them . </P> <P> LAHSO was previously called SOIR (Simultaneous Operations on Intersecting Runways), and incorporates and expands all SOIR definitions . </P> <P> There are three main types, to land and hold on the runway: </P> <Ul> <Li> Intersecting Runway: before the intersection with another runway that will have another aircraft taking off or landing . </Li> <Li> Intersecting Taxiway: before the intersection with a taxiway that will have other aircraft taxiing for takeoff or parking . </Li> <Li> Point on Runway: before a designated point . This is the newest type, used when safety precautions are needed due to hazards concerning other runways or taxiways, or hazards for a landing plane on its runway (ice, for instance). </Li> </Ul>

A land and hold short (lahso) clearance