Vulnerability was discovered by Noam Rotem, an Isreal security researcher when he was trying to book a flight in ELAL Israel Airlines. He uncovered this critical flaw in the widely used ticket booking system Amadeus that allows anyone to access and change private information on flight bookings for 141 airlines. The same vulnerability was discovered include 44% of the international carriers market including United Airlines, Lufthansa, Air Canada, and many more that affects tens of millions of travelers.”]
Source: https://gbhackers.com/airlines-security-vulnerability/