I think 4 think covered the Shuttle launch themselves, or they tossed to CBS later on not sure I tuned them in for 5 seconds and saw their graphics. WTVJ used NBC and WPLG used ABC at 10:30am. 7 of course relied on themselves as usual breaking in at 10:30am as well. Which wasn’t a bad thing to do at all.
I watched MSNBC and these talking heads during the actual launch were so annoying, Brian Williams and this other guy talking over the NASA commentor and shuttle crew the whole time. I did record WSVN on the DVR expecting a more clear uninterrupted coverage and I was right.
They stopped talking about 2 minutes before the lunch and went about 12 minutes overall with no interference from anyone, just pure NASA-TV feed.
You can see the complete video of 7’s shuttle coverage here and click on Discovery: Return to Flight