Join Date: Oct 2006
Location: London, UK
Programs: BA Gold, VS Silver, SQ Silver, IHG Plat Amb, Hilton Gold, Marriott Plat, Accor Silver, Radisson Prem
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Do you mean that all F seats are blocked except one? This may be a mistake. Check on MMB to see the exact seat map.
Usually when a 4 class 777 is used as 3 class, the F cabin is kept empty due to the crew not have received training on how to 'use' the F seats.