The original Top Gun did use some special effects models (they didn't really put a Tomcat in a flat spin, or shoot one down in the dogfight at the end of the film). The CGI I've seen of the latest Top Gun so far appears to be a cut above what you'd usually expect in a movie, and it seems they've used it sparingly (they can't really fly an F-14 against an Su-57, and they can't really shoot down a Super Hornet). Fingers crossed that remains the case when it's actually released,
Interestingly, that Northrop Grumman movie uses the theme music from The Final Countdown, which is arguably the best US Navy carrier aviation movie of them all.