I noticed (while playing in world 506,) that there seems to be a problem with the game in the area of 0.5 routes:
- First, I noticed the game showed me the ^ carat symbol meaning "no one-way flights" for planes that had only one 0.5 route on them at the time.
- I was, however, able to make further 0.5 routes with those planes.
- Furthermore, the game, when I tested it to see if it would, allowed me to make a third 0.5 flight on an aircraft which would logically be unable to do this. (it happened to be plane id #8380) Of course, I then closed the route.