I've not seen in flight power available in Coach cabins domestically... ever. I fly Business class on a handful of routes that Delta services, but I never actually checked for availability of power.
In Coach, it's so cramped I can't sleep, and using your laptop is the best thing to do to take your mind off the uncomfortable accommodations you have. When I'm up in Business/First, I order a Jack on the rocks and go to sleep
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it is NOT grounded and does not include the LED on the tip like apple's AC adapters do....
but its not a bad investment considering it is only $20 more then apple's adapter...
In Coach, it's so cramped I can't sleep, and using your laptop is the best thing to do to take your mind off the uncomfortable accommodations you have. When I'm up in Business/First, I order a Jack on the rocks and go to sleep