1261 said:. .. ."ICAO standard terminal airspace is Class B, CTR is Class C". .. .I don't believe there is any ICAO standard for what airspace is used where. It was a major achievement for ICAO to get the labels agreed according to services provided, and I don't think there was any intention to standardise the services themselves.. .. .There are very wide differences.. .. .UK uses A and D for CTRs, A and D for terminal areas (with some IAPs in class G).. .. .USA uses B/C/D/E for CTRs, B/C/D/E for terminal areas (also with parts of some IAPs in class G). . .. .Belgium uses C/D for CTRs, B/C for terminal areas.. .. .Germany uses D for CTRs, C/D for terminal areas. Also some F.. .. .France uses D/E for CTRs, A/D/E for terminal areas.. .. .The Netherlands uses A/C for CTRs, A/C/E for terminal areas.. .. .The list goes on.... . . . <small>[ 30 March 2002, 00:23: Message edited by: bookworm ]</small>