So this week I was able to test the GB keyboard cover on both armrest trays and the normal back of seat trays. Even with my larger size I was able to use the GB with a seatback tray however I had to fold it over into the tablet mode for the armrest tray. I was in a bulkhead economy plus seat on a 737-800 and it did not slide forward enough to allow the 4-6" front overhang needed to allow the rear support of the GB.
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