Towards the end of Transformers 4 Optimus Prime flew towards deep space without a ship, while in Transformers 3, the Autobots needed a big ship to travel to moon.
How is he able to do it? Was he upgraded?
Science Fiction & Fantasy Stack Exchange is a question and answer site for science fiction and fantasy enthusiasts. It only takes a minute to sign up.Sign up to join this community
The best guess is that Optimus obtained the rocket boosters when he pulled the sword of the Knights' Temenos from Lockdown's ship in the final act.
After pulling the sword where he said:
Recognize one of your Knights.
He gained armor and most likely other upgrades (such as whatever allowed him to KO Grimlock with a right hook).
This is the 2nd form we see Optimus in during the movie. The 1st is the junker truck.
The reason is because when he pulled the sword out of the Temenos, it upgraded his body to be more armored and turning his Pathblasters/ ultra Pathblaster into his shield/ultra Pathblaster; It also altered his legs and back so it could house thruster rocket jets in those parts of his body, this made it so he could fly without his trailer flight gear. Also he was able to refuel on energon while he was on the ship he and the Autobots stole from Lockdown and freed the Dinobots from, so he had plenty of energon; and the speed and velocity at which he was moving meant he was able to move at the same speed as a rocket flying into space which is 7 miles per second or 25,000 miles per hour, fast enough to leave earth and fly to Jupiter and throw the seed into its atmosphere; as he did so, he decided to power down to a level where he could still function but conserve energy, and thanks to the speed he was going he could continue until he came back to Cybertron where he would power back up before landing.