Exactly Jaba In certain ops airswitch plus .1 is simply no where near an accurate indication of chocks on to chocks off in say circuit ops in a Baron/Bo on a short runway where for safety each landing is a full stop and taxi back to the end of the runway - perhaps wait at the holding point etc etc. A session of circuits of .5 airswitch could be up to 1.0 in chocks to chocks time.