I mean, it’s not trademark infringement in the first place, because Delta is in a different trade than Adobe is. Any trademarks Adobe has would only apply to trades they’re active in. Since Adobe doesn’t make emulators, any trademark infringement claim is shaky at best.

The whole point of trademarks is that they’re a mark of your trade. If you’re a plumber with a trademarked logo, you can’t sue a video game company for using your logo. Because it’s a totally different trade, and your trademark doesn’t apply.

Delta just changed the logo because they don’t have a massive legal fund to go up against Adobe’s army of corporate lawyers.