You will see a short video on US A321s on shorter domestic runs e.g. CLT
to Florida - after the safety video is shown (on the ground, of course), they turn the monitors back on right after takeoff and show COMMERCIALS for various USAirways products (e.g. the frequent-flyer program, Caribbean vacation packages etc.). The sound is played over the PA so you can't ignore the intrusion. Very tacky, I thought.
Of course UA
(my particular frame of reference) plays tons of commercials on its shorter domestic flights in between "Friends" and the other NBC-based programming, but you can ignore it if you don't want to listen with your headset.
USAirways is definitely a notch or two below United in this respect.