The ending of Jurassic Park 3 is a rescue that works because Alan Grant works out what the raptors actually want and gives it back. The pack stalks the group only because Billy secretly took raptor eggs. Once Grant understands that, he returns the eggs, and the film treats the raptors as animals with a motive and not as simple villains.
The satellite phone call is what brings help. The survivors reach the beach, and the Marines and Navy forces who arrive had been alerted by that earlier call. Grant, the Kirbys and Billy fly away from Isla Sorna by helicopter, and the family is reunited. Before that, Grant uses a replica of a raptor resonating chamber to confuse the pack, which is the film's clearest use of his paleontology.
The last shot has Pteranodons flying over the ocean. In my opinion, that image says the island's dinosaurs remain alive and free in the wild, and it is a small step toward the later films, where Jurassic World (2015) opens twenty-two years after the events of Jurassic Park (1993) and Jurassic World Dominion has dinosaurs living all over the world. It could be argued that the aviary scene, where the Pteranodons attack the group, plants the idea of a species able to leave the island.
Perhaps the cleanest way to see the film is as a short, direct survival story. It has no post credit scene, it ends on the Pteranodons, and at 92 minutes it moves faster than either Spielberg film. That is a strength if you want a quick creature feature, and a limit if you want the slow build of Jurassic Park (1993). If that is what you are after, the original is the better starting point, and the Jurassic Park movies ranked page gives my full order.
