When did I say the news media isn't biased? I believe I've pointed out several times when the news media has lied or when CNN was bashing Trump over something they'd suck Obama off for. If Obama went to North Korea, CNN would be working on his next peace prize and I'd still be saying it's a waste of time for our country. I've also said that the news went downhill when the 24 hour news channels began because there simply isn't that much interesting to talk about and now there are several that compete against each other for ratings. So now they have to make drama up by finding how a minority of people feel and pass that off as how the majority feels on a subject, then the majority gets upset and they have ratings. The news media is often biased, but they're not always biased. And I don't get to just yell "fake" if something is real, but I don't agree with it or it offends me. That's the difference.
I have no doubt that their hatred of Trump played into their decisions to not air this. Were they ever planning on airing it or are they just coming out now to win points with their viewers who are also against Trump? This is a new event, so there isn't really precedent. Most channels will show major political things like the inauguration or the Sate of the Union, but not everything that happens in Congress. Same as all channels might say the Thanksgiving day parade is happening, but only one channel shows it. The media has a duty to report that something is happening, but they don't have to provide a forum or platform for anybody. And I can't ignore the things that Trump has said about the news media which I think is highly reckless and dangerous in the current environment, but he's not the only one to blame.
In the end, I'm simply saying that I don't think your example is a fair comparison. All the major news agencies (aside from what I can tell, MSNBC, but I didn't dig very far) have it on their front page. They're reported on it and are continuing to report on it. Just like they've reported on him playing golf. To me, those two things are comparable. Not showing the Salute to America and also not showing Trump playing a full game of golf, to me is also comparable. Just because I think your example wasn't fair, doesn't mean I think the news media is infallible or without bias.