Strange questions. (Conspiracy theorists, perchance?) Air Sinai did indeed exist, and operated knackered old B737-200's. Perhaps only one. I flew with Air Sinai as a passenger, once, on business, CAI-TLV. Awful security in CAI. Quite the opposite at TLV. The flight was short, lousy service, and the aircraft was less than one half full. No markings as I recall. White, Egyptian-registered, with Air Sinai in red on the fuselage and fin. I was relieved to land safely in Tel Aviv.