To be fair, it's basically the same design. While, according to Gizmodo, Delta has claimed its symbol to be a stylised version of the Greek Delta symbol as opposed to Adobe's 'A', both feature an upwards-pointing triangle with half a crossbar at the bottom.
Somewhat hilariously, Delta has responded to the dispute by releasing a temporary new logo, in which the top of the logo appears to have been sliced clean off. 'Adobe is threatening legal action because they think our logos are too similar - so we changed it!' Delta announced on Mastodon.
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