The mentions of TOPS above are a brain misfire. ETOPS was altered repeatedly but it was always named ETOPS, at first allowing 90 minutes, then 120 minutes and e

The mentions of TOPS above are a brain misfire. ETOPS was altered repeatedly but it was always named ETOPS, at first allowing 90 minutes, then 120 minutes and eventually 180 minutes of assumed single engine range. A modern twin engine jet can go a long way in 180 minutes at design single engine performance.