Meanwhile, the A330-300 and A350-900 offer 30–31 inches and 37–38 inches. Last summer, Boston and Washington were served by Iberia's A330s and A350s, which offer up to 166 more seats per flight.

Iberia on Oct. 26 will launch service between Madrid and Orlando, Fla., the carrier announced Tuesday. Flights will operate four times weekly with Airbus A330 aircraft with capacity for 254 passengers ...