United Airlines’ (UAL) Boeing 777s May Remain Grounded in 2021 Posted byZacks Equity Research August 31, 2021 Leave a comment on United Airlines’ (UAL) Boeing 777s May Remain Grounded in 2021 United Airlines’ (UAL) Boeing 777 jets, one of which was involved in the Denver flight scare in February, continue to be under review by the FAA and m…