I was lucky enough to have an AAgent at IAD take the time to print off a sheet of paper that shows all the AA aircraft types, and then lists all the rows, and seats that DO NOT have power ports located in those rows.
This has served me well numerous times when it comes to changing seats at the airport.
For those interested, I will copy the list below.
The following Rows and Seats DO NOThave power ports.
MD80: ROWS 14,15,18,22,25 and 27-31
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F100: ROWS 11,12,15,17 and 19-21
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A300 2 Class Service: ROWS 12,13,15,16,18,19,21,22 and 24-35
Seats - 11CDFG,14CDFG,20CDFG,23CDFG
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A300 3 Class Service: ROWS 23-25,27,30 and 32-35
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B767-200 DOMESTIC/2ER: ROWS 28,29,31,32,34,35 and 37-39
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B767-300 INTERNATIONAL: ROWS 25,26,28,29,31,32,34,35,37,38,40 and 41
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B767-300 HAWAIIAN: ROWS 15,25,26,28,29,31,32,34,35,37,38,40 and 41
SEATS - 11CEG,12ABHJ and 13CEG
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757: ROWS 15,18-20,22,24,26,27,29,30,32-34
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737: ROWS 15,16,18,19,21,23,24,26 and 27
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777 ATLANTIC: ROWS 32,35 and 40-44
Seats - 31CDEFG,33ABHJ,34CDEFG,36ABHJ,37CDEFG,38ABHJ,39CDE FG
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777 PACIFIC: ROWS 28,31,34 and 37-40
Seats - 27CDEFG,29ABEHJ,30CDEFG,32ABEHJ,33CDEFG,35ABEHJ,36 CDEFG