Board Thread:Questions and Answers/@comment-98.206.237.129-20130902040449/@comment-4748654-20130905085516

AC5 had that feature. It just wasn't available in every mission like in AC04, where whenever you felt like it you could go back to base and rearm yourself, whereas in 5 landing appeared in specific missions, mostly after their completion (and takeoff appeared in others before the missions started, e.g: Operation Bunker Shot - the 10th mission in AC5).