Sơ đồ chỗ ngồi KLM Royal Dutch Airlines Boeing 787-9

Four-tier KLM long-haul stack on the Boeing 787-9, the shorter sister of the 787-10: World Business Class (JAMCO Venture, 1-2-1 reverse-herringbone, all-aisle-access), Premium Comfort (2-3-2), Economy Comfort (extra-legroom zone within Economy) and Economy (3-3-3, 9-abreast). BUSINESS PRODUCT: the 787 World Business Class is the EARLIER JAMCO Venture seat WITHOUT the sliding privacy door — per the KLM newsroom the sliding door is the newer product introduced on the Boeing 777 fleet (2023); the 787 seat has a movable centre partition and direct aisle access but no door, so it is modelled here without privacy_door. LAYOUT DERIVED_FROM_COUNTS: 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, 787-9 row, as of June 2026): 13 airframes, J=30 World Business / W=21 Premium Comfort / Y+=48 Economy Comfort / Y=176 Economy = 275. The assignment's ~24 Economy Comfort / ~219 Economy (~294) hint is SUPERSEDED by this table: 48 Economy Comfort + 176 Economy = 224 in the single Economy cabin, total 275. MODELLING: business rows 1-8 in 1-2-1 (30 = 7 full rows of 4 + a final centre pair D/G at row 8, since 30 does not divide evenly into 1-2-1 rows and the cabin narrows toward the rear galley). Premium Comfort is 2-3-2, 3 full rows of 7 = 21 (rows 11-13; rows 9-10 skipped for the galley/vestibule per common KLM numbering). Economy Comfort is modelled as a ZONE within the single Economy cabin per AUTHORING §6 (seatTypeId economy-comfort, canonicalTier extra_legroom_economy, contributing the 48N token) — NOT a separate cabin: rows 15-19 full 9-abreast (45) plus a 3-seat centre triple at row 20 (D/E/F) = 48. Standard Economy is rows 21-40 (176): row 21 a bulkhead exit row at door 3 (extra legroom), rows 22-38 full 9-abreast (153), a galley-approach row 39 (9), and a 5-seat last row 40 that narrows to a port triple (A/B/C) plus a starboard aisle+window pair (G/J) ahead of the aft galley/lavatories. DERIVATIONS / UNPUBLISHED: door positions (doors 1-4), the over-wing span (rows 20-31), all partial-row narrowing, and all seat-type pitch/width/recline (including the widely-published ~38-inch Premium Comfort pitch, which KLM lists on klm.com but which times out for archiving here) are structural estimates; rows 9,10,14 are 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 787 window grid exists, so windowGridType is omitted).