United's A321-led overhaul adds Polaris suites, A321XLRs and premium CRJ450s — upgauging cuts fuel burn 36%
United unveiled a sweeping fleet and cabin overhaul centered on the A321 family and 787‑9s, adding Polaris suites, lie‑flat Coastliner A321neos, A321XLRs to replace 757s and a premiumized CRJ450 regional. Upgauging and denser seat output reduce fuel burn by more than 36%, United says.