Helinet: N71HD is KABC's main Air 7 HD since 2005, with the branding scheme. It is not used by any other station for video feed or on-air reporting. This ship has the Shotover camera for the MapTracking system. Helinet, the provider for KABC/KCBS/KCAL/KTTV/KMEX always flip flops whatever backup choppers they have, as needed. N828AP is one of Helinet's newest A-Stars, and that is now used as the primary backup ship for KABC. It was the first to have the call sign taken off of the online tracking servers. N828AP is in a black color scheme, and is occasionally used for outside production purposes. KABC also has their old original 1995 "Air 7" N67TV, which is in the grey paint scheme. Since N828AP has been in use, N67TV has been used as a backup for all of the Helinet stations, as well as outside production purposes. In the photo KABC posted 5 years ago, N67TV is seen on the right hand side. Those KABC logos are never on there.
N111FN and N211FN used to be the sold KTTV ships. N111FN was destroyed at VNY a few years back. Now, it's a toss up between whatever is flying. KTTV in the morning can use N211FN or N29HD with Rick Dickert reporting. KCBS/KCAL with Stu Mundel uses the same ship usually in the evening for their reports. N29HD is the preferred ship, as it has the "Shotover" camera which allows for the MapTracking. As for N29FX, that's also a backup ship used by whoever. It's the oldest A-Star in the fleet, so just used when needed.
Welk Aviation formerly Angel City Air: KTLA uses N925TV, which was recently repainted in a blue paint scheme, similar branding look to their news trucks. In recent times, KTLA's primary backup is N12YJ. N12YJ is unbranded and is unique because the camera controls are "shotgun" up front with the pilot, not in the backseat. Both choppers are based out of Pacoima. KNBC uses N358TV as News Chopper 4 Alpha and it's based out of Pacoima. KNBC News Chopper 4 Bravo is based out of Fullerton base, and it's normally N29LW. This chopper is unbranded. Welk Aviation used to have N1231A also as a backup, but it's being used by NBC in Boston. Last but not least, N61HL is still around (the former Sky 9 bird) and it's used as an unbranded spare for Welk Aviation.
You can log onto http://www.adsbexchange.com/ and see all of the tail numbers un-blocked, when they're flying.