China Eastern Airlines Airbus A350-900 seat map

Single four-class China Eastern A350-900 configuration. Airbus's 2018 first-delivery press release states the "four-class cabin layout of 288 seats: four first, 36 business, 32 premium economy and 216 economy"; Wikipedia's China Eastern fleet table lists 20 airframes in service at this single configuration (4 / 36 / 32 / 216 = 288). China Eastern brands the four front-row suites "Business Plus": Wikipedia describes them as larger suites (greater length than standard Business) with a sliding door and a minibar, whose centre pair converts into a shared "living room" — Airbus counts them in the First column, so they are modelled as canonicalTier first. Wikipedia states A350 Business is a modified Thompson Vantage XL with privacy doors in 1-2-1. China Eastern does NOT publish a seat map, a row grid, or seat pitch/width for the A350, so all row numbering, column letters, cabin boundaries, door/exit positions, the over-wing span (rows 24-38) and the aft last row are DERIVED from the published counts and standard A350-900 door/wing geometry: Business Plus 1-2-1 row 1 = 4; Business 1-2-1 rows 2-10 = 36; Premium Economy 2-4-2 rows 11-14 = 32; Economy 3-3-3 rows 20-43 = 216. Every cabin carries derived:true and windowAlignment is left "unknown" for window seats because a derived grid cannot prove a real window lines up (no A350 window grid exists, so windowGridType is omitted). No seat pitch/width is published by China Eastern or Airbus, so no numeric dimensions are asserted (unpublished).