El Al has cancelled daytime flights from Tel Aviv's Ben Gurion airport to the southern Israeli city of Eliat in an escalating dispute with the nation's civil aviation authority.
The airline contends that a new visual approach to Eilat airport is unsafe, but the regulator has now refused to renew a waiver, meaning that the landing technique must be adopted by El Al from 26 September.
"Security considerations" led the Israeli CAA to adopt the new pattern.
Isaeli carriers Arkia and Israir are continuing to flying to Eilat with Airbus A320s, ATR 72s and Boeing 757s.
El Al has been using 737s to operate its thrice-daily service to the Red Sea resort town.