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All UA A319s have have been converted to 12F configuration
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FIRST CLASS CABIN
All A319s have the 'new' UA first class seat. There are 12 first class seats on the A319. Stated pitch is 37" and the width is 21”. The seat recline on the A319 is quite generous, with the caveat that if the person in front of you is fully reclined, it is difficult to get out of the aisle seat and exiting the window seat will require the aisle seat to step into the aisle.

ECONOMY PLUS Section – ROWS 7-21
Row 7 is the best row. Like on the A320, Row 7 has plenty of room plus the bulkhead does not extend all the way down to the floor, allowing you to store bags and your feet under Row 2.

21BC and 21DE do have an extra inch or two of legroom to allow folks to get to the Window Exit, but it is not nearly as generous as Row 20 and Row 21 on the A320.

Rows 8-12 have 35" of legroom and 18" width.

ECONOMY CLASS Section – ROWS 22-35
Pitch is very tight at (30"), but at least the seats are wider then the 757.

IN FLIGHT ENTERTAINMENT
Wifi: Ku band wifi is installed on all A319s. Ku band wifi is the international wifi which enables internet access for the rare A319 trip outside of the lower 48.
Entertainment: Personal device entertainment is installed on all A319s. Make sure you have the latest United app loaded on your phone/tablet.
In-Seat Power: Installed in F and E+.


Other
There is a galley and lav at the front of the plane for First-class cabin.
There is a galley and two lavs at the rear of the plane for the economy cabin.

Related thread: Consolidated Where to Sit on a United Plane Threads