re: Delta passengers fall ill while stuck on tarmac for hours in Las Vegas heat wave

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Im not an airline pilot, only private, but most of the time they taxi with only one engine.

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Sometimes but not always. I fly the A350 and we never taxi out on one. In, yes. The airlines prefer to save gas and that’s one way of doing it.

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APU isnt strong enough to propel the plane by itself, only to run the generator for power in the plane.

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Some aren’t, some are. I could start 2 engines at a time on the 747 using the APU. It was better than many small bizjet engines. Couldn’t use it for thrust obviously but it kicked arse!

Give this incident a few days or a week and more details will likely come out. I’ll be on off days and typically leave all things “work” at work but if I hear something I’ll try to respond.