The UK and Egypt asked their airlines on Wednesday to avoid Iranian and Lebanese airspace amid growing fears of a possible broader conflict in the region after the killing of senior members of militant groups Hamas and Hezbollah, Reuters reports.

Many airlines globally are revising their schedules to avoid Iranian and Lebanese airspace while also calling off flights to Israel and Lebanon.

US-based United Airlines said on Wednesday its flights to Tel Aviv, which were paused on July 31 due to security concerns, remained suspended.

Delta Air Lines has paused its flights between New York and Tel Aviv through Aug. 31.

Similarly, Egyptian airlines have already been avoiding Iran's airspace.

Egypt's NOTAM, a safety notice provided to pilots, said the instruction would be in effect from 0100 to 0400 GMT on Thursday.

Egypt's civil aviation ministry later confirmed on Wednesday the notice was intended to reduce flight safety risks in light of a notification it received from Iranian authorities.

"Military exercises will be conducted over Iranian airspace on Aug. 7 from 11:30 to 14:30 and from 4:30 to 7:30 on Aug. 8 Tehran time," the statement said.