Jed York has been in charge of the 49ers since 2008. (Marcio Jose Sanchez/Associated Press)

The 49ers are suffering through a dismal season, which has fans longing for the good old days — such as last year, when the team went 8-8. Oh, and not to mention the three previous seasons, when San Francisco won a combined 36 regular-season games and went to three straight NFC championship games.

Of course, all those good times came while Jim Harbaugh was head coach. But after the 2014 campaign, the coach left San Francisco, and team president Jed York described the situation as “in our mutual best interest to move in different directions.”

Harbaugh moved on to Michigan, and while he has revived the Wolverines’ program, his replacement, Jim Tomsula, hasn’t fared quite as well. The 49ers took a 3-7 record into Sunday’s home game against the Cardinals, which was the scene of this airborne protest:

Before the game got underway, a plane circled around Levi’s Stadium carrying a banner that read, “Jed & 49ers should mutually part ways.” The message expresses the discontent many San Francisco fans have with York.

That discontent goes beyond the feeling that the team president pushed Harbaugh out and replaced him with a vastly inferior coach. There have long been questions about York’s qualifications for his job, considering that he is the son of the team’s principal co-owners and the nephew of former owner Edward J. DeBartolo Jr.

Whereas DeBartolo earned the admiration of 49ers fans for presiding over one of the most successful runs in sports history, when the team won five Super Bowls between 1982 and 1995, York hasn’t quite gotten the same benefit of the doubt. San Francisco’s recent run of success appears to have quickly ended, and some in Niners Nation are pointing the finger straight at the top.