Sơ đồ chỗ ngồi KLM Royal Dutch Airlines Boeing 777-200ER

Four-tier KLM long-haul stack on the refurbished Boeing 777-200ER, the shorter sister of the 777-300ER: World Business Class (JAMCO Venture, 1-2-1, sliding privacy door), Premium Comfort (2-4-2), Economy Comfort (extra-legroom zone within Economy) and Economy (3-4-3, 10-abreast). LAYOUT DERIVED_FROM_COUNTS: KLM's own aircraft page (klm.com) times out for automated fetch and KLM publishes no citable per-seat raster, so the row grid is a structural reconstruction from published counts (Wikipedia KLM fleet table NEUTRAL for the split; news.klm.com PRIMARY for the products), hence every cabin carries derived:true and layoutProvenance derived_from_counts. COUNTS (Wikipedia KLM fleet table, 777-200ER row): 15 airframes, J=35 World Business / W=24 Premium Comfort / Y+=54 Economy Comfort / Y=175 Economy = 288 (the assignment's ~275-economy hint is superseded by this table: 175 Economy + 54 Economy Comfort). Business and Premium Comfort counts (35/24) are identical to the 777-300ER; the -200ER carries the whole difference in Economy (175 vs 266) and Economy Comfort (54 vs 56). MODELLING: business is split into a forward WBC cabin (rows 1-6, 24 seats) and a small rear WBC cabin (rows 7-9, 11 seats); 35 does not divide evenly into 1-2-1 rows, so the final derived business row (9) seats a window plus the centre pair (3 seats, A/D/G) with the K position given to a galley/closet monument. Premium Comfort is 2-4-2 on the wider 777, 3 full rows of 8 = 24 (rows 10-12). Economy Comfort is modelled as a ZONE within the single Economy cabin per AUTHORING §6 (seatTypeId economy-comfort, canonicalTier extra_legroom_economy, contributing the 54N token) — NOT a separate cabin: rows 14-18 full 10-abreast (50) plus a 4-seat exit row 19 at door 3 where the side triples are removed for the door vestibule/cross-aisle, leaving the four centre seats (D/E/F/G) = 54. Standard Economy is rows 20-37 (175): rows 20-36 full 10-abreast (170) with the pre-exit row 29 (limited recline ahead of the door-4 over-wing exit row 30, which carries extra legroom), plus a 5-seat last row 37 that narrows to a port triple (A/B/C) and a starboard aisle+window pair (H/K) ahead of the aft galley/lavatories (centre bank and the J seat removed). DERIVATIONS / UNPUBLISHED: door and exit positions (doors 1-5), the over-wing span (rows 24-34), all partial-row narrowing, and all seat-type pitch/width/recline except the published 38-inch Premium Comfort pitch are structural estimates; row 13 is skipped per common KLM numbering. windowAlignment is left 'unknown' for window seats because the grid is derived and a real window cannot be proven to line up (no 777 window grid exists, so windowGridType is omitted).