This is excellent news for LTN but I fear, as VA says, these additional flights operating from/to the east (all departing via Brookmans Park) are going to put a very severe strain on the ATC system and the London airspace in that area. LTN is already now generating 400+ flights a day and is now probably going to nudge towards 450 by the end of the year and there is a very real risk that system will just not cope
