Originally Posted by ifleeplanes
The B737-800 does suffer badly from NEI and Boeing have approved an area on top of the wings to have iceing present, it is marked with black lines.
True, the 737NG's have a cold soaked fuel frost area that does not necessarily have to be de-iced prior to take-off, but several stringent conditions must be met: the frostlayer may not be too thick (if I recall correctly 1 to 2mm), it must be similar on both wings, it may only be present within the area enclosed by black lines and certainly not on leading edges and flight controls, there may be no visible moisture or precipitation, and OAT must be above freezing level. Assuming the circumstances described in the letter are correct, these conditions were not met in this case.
This is just a factual observation, by the way. I share dav8r's concerns regarding the motives of the original poster, but I prefer not to delve into those depths.