Sơ đồ chỗ ngồi KLM Royal Dutch Airlines Boeing 737-800

KLM's Boeing 737-800 short-haul Euro-style cabin. 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 seat counts (klm.com/news.klm.com PRIMARY for the products; Wikipedia KLM fleet table NEUTRAL for the counts) — no seat position is read from a published map, hence cabin.derived true and layoutProvenance derived_from_counts. COUNTS: the Wikipedia KLM fleet table lists the 737-800 as 20 Europe Business (J) / 6 Economy Comfort (Y+) / 150 Economy (Y) = 176 sellable seats across 27 airframes. MODELLING (AUTHORING.md §6, same pattern as the ba-320n-180 exemplar): KLM European short-haul is a single physical 3-3 economy deck in one hardware type. Europe Business Class is created by a MOVABLE divider at the front with the adjacent middle seat kept permanently empty ('the middle seat is always left empty and can no longer be reserved' — KLM newsroom, Europe Business update); its extent varies flight-by-flight with demand. Because the seats are the same economy hardware and no fixed cabin boundary exists, this is modelled as ONE economy cabin (canonicalTier economy) with Europe Business expressed as a demand-dependent ZONE (representative maximum rows 1-5) rather than a separate cabin, and NO seat carries a business tier, so cabinSummary carries no J token. The 20 sold Europe Business seats = 5 rows x 4 sellable (columns A/C/D/F, middles B/E blocked); the 10 blocked middles are modelled as physical seats with bookable:false, unsellableReason guaranteed_empty and the blocked flag. Economy Comfort is an extra-legroom ZONE within Economy (KLM sells it as a fee product, not a separate cabin) — modelled with a distinct seatTypeId whose canonicalTier is extra_legroom_economy, so it contributes the 6N token; KLM newsroom states Economy Comfort offers 'up to nine centimetres more legroom and back supports that can recline 40% more', sits at the front of Economy and has in-seat power. RECONCILIATION: totalSeats 186 counts all physical seats (31 rows x 6); subtracting the 10 guaranteed-empty Europe Business middles gives sellableSeats 176, which matches the Wikipedia 20+6+150 total. DERIVATIONS / UNPUBLISHED: config.representative true — the divider position and the exact number of Europe Business / Economy Comfort rows vary per flight and per tail (the fleet is partly refurbished: KLM renewed 14 of the 737-800s in 2021-2022 with new Business/Economy seats, USB power at every seat, Wi-Fi and larger bins). The two overwing emergency-exit pairs are placed at rows 16 and 17 from 737-800 door geometry (data/window-grids/737-800.json: fwd overwing exit ~658 in, aft ~696 in from the nose); Economy Comfort is placed at row 6 (front of Economy, one row = the Wikipedia Y+ count of 6). No pitch/width/recline is published per cabin, so all seat-type dimensions are unsourced estimates. windowAlignment is left unknown for window seats (A/F): the grid is derived, so a real window cannot be proven to line up; the window-alignment script was run in report+apply mode and applied only high-confidence structural blanks. Amenities are from KLM newsroom press material (Wi-Fi, no seatback screens, USB power), not from a seat map.