It was rumored that the plot would be centered around drone warfare before Tom Cruise confirmed this sequel would be going back to fighter jets. Drones will still serve some point of the film's plot, however.
Miles Teller was cast in the role of Goose's son, beating out the likes of Nicholas Hoult and Glen Powell. All three were flown to the home of Tom Cruise, the star of the film, for chemistry tests. Powell was later cast in the film in a role beefed up for him, having impressed Cruise, producer Jerry Bruckheimer, as well as executives at Paramount Pictures and Skydance with his auditions.
Its original release date was to be on July 12th, 2019. It would have released one week after Spider-Man: Far from Home (2019) and one week before The Lion King (2019). On Wednesday, August 29th, 2018, around a month or two into filming, its release date was pushed back to June 26th, 2020, removing one of 2019's most anticipated films.
During a July 2019 interview with Entertainment Tonight, Kelly McGillis said that she was not asked to appear in this movie.. When asked why she thought she wasn't contacted, she said, it was likely because "I'm old and I'm fat and I look age-appropriate for what my age is, and that is not what that whole scene is about. I'd much rather feel absolutely secure in my skin and who and what I am at my age, as opposed to placing a value on all that other stuff."
Maverick's jacket in Top Gun (1986) featured patches of the Japanese and Taiwanese (the Republic of China) flag, in Top Gun: Maverick (2020) the jacket remains the same but those two flags have been replaced with ambiguous symbols.
It was speculated that this is because Chinese company Tencent co-funded the film.
Kelly McGillis won't be returning in the sequel as Charlie, Maverick's Top Gun instructor and love interest from the original film and maybe written out of the sequel. There's speculation that Charlie may had passed away or broken up with Maverick prior to the new movie.