FlyerTalk Evangelist and Ambassador: The British Airways Club
Join Date: Jun 2008
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Posts: 33,191
The bin is for the use of the window pax just like under seat space is for the use of the pax in the seat behind it.
if you accept you shouldn’t have told Ms 62A « excuse me, I need to put my backpack under the seat » , then ms 62B had no business claiming the bin space by your seat either.