JERUSALEM (Reuters) – Israeli airline El Al said on Sunday it was returning Boeing 777-200ER aircraft to its fleet to meet high travel demand during the summer. Israel’s flag carrier sidelined six 777s at the outset of the COVID-19 crisis when it halted all flights between March and September 2020 amid plunging demand. Its aging 747s had already been retired and replaced by 15 new Dreamliner 787 aircraft on long haul routes to North America and Asia. The airline has six 777 planes with an average age of nearly two decades and said it would return some of them to service for its routes to Bangk…