As others mentioned, Delta is flying a mixed fleet where some planes have better WiFi than others. Additionally, there are delta-branded non-delta-managed fligh

As others mentioned, Delta is flying a mixed fleet where some planes have better WiFi than others. Additionally, there are delta-branded non-delta-managed flights and I’ve found those have bad WiFi too. So it definitely “could be you” except that doesn’t really matter since if all you have available on your routes is trash, free trash is still trash.