United Airlines will introduce a new first class seat on an Airbus A319 next week

and will retrofit about 200 A319s, A320s, Boeing 737s and 757s through 2016. Tray tables with tablet holders will accompany leather seats whose bottoms move forward as the backs recline. The 21.1-inch seats, wider than existing ones, also will feature universal A/C power outlets, side stowage and beverage holders.