That was one of the points I was going to make. An air marshal isnt going to bump you from a window seat. Also, if it was row 7, there could have been an issue with an equip change....a 757 with 7 rows gets changed to 6 and then back to 7 casuing a few seats to seemingly open up in the computer because original occupants were reassigned etc.....

Also, do you know what seats the other 2 diamonds had...and did you see who was in "your" 4D seat...