The Iron Eagle sequels were pretty bad. The first one is a rather simplistic 1980s fighter jet movie. But it had a great soundtrack, some good areal footage for the time, memorable characters, a good cast & generally stands up as a fun, if silly movie.
******Spoilers Ahead*******
Iron Eagle II opens by killing off the main character from the first movie in the first few minutes. This was done because actor Jason Gedrick was committed to another movie during the time they wanted to film. They fill the role of young hot shot pilot with Doug's former wingman, who is a played by an actor who lacks Gedrick's charisma and screen presence. The climax is lifted almost totally out of the original Star Wars except having the fighter jets fly through a desert canyon rather than a trench on the Death Star. The soundtrack is filled with forgettable songs from wannabe rock & rollers and pales in comparison to the classic songs from the first movie.
Aces: Iron Eagle III gives us a dumb plot about four WWII aces from the US, Japan, Germany & The UK teaming up to take on some central American druglord in vintage WWII aircraft. The action scenes are often fake & cartoony looking. The supporting cast is bad with a wisecracking "gangsta" stereotype who mostly talks in catch phrases that sound like they were written by a 50 year old white guy trying to imagine what a hip 20 year old black guy would say. Former female body building champ Rachel McLish plays a sort of Sarah Connor meets Rambo tough action hero & you get about what you'd expect when you cast a body builder in an acting role. Some of the areal sequences with the old planes are cool, but the idea of arming those craft with modern ordinance is ridiculous and looks it on screen. Also it changes continuity from the other movies, casting Chappy as a WWII ace. The movie is set in 1992 while he and the other aces aren't nearly old enough to have been pilots during WWII.
Iron Eagle IV was a direct to cable movie with a budget to match. They decide to bring Doug (main character from the first movie) back from the dead by saying that he ejected before his plane blew up at the beginning of part II but than spent several years in a Russian KGB prison. The plot is he and Chappy trying to run a flight school for troubled youth so we get a supporting cast of mostly annoying "bad kids who just need to be reached" stereotypes. They couldn't get Jason Gedrick to return as Doug so they recast the character with some other actor. The areal sequences are pretty lame thanks to the movie's cable-TV budget and the only action with real fighter jets was stock footage obviously reused from the first two movies.