Trouble choosing planes

After you download Aircraft Simulator, run it for the first time and choose the plane. After that, I tried to choose another plane, but the rest of the planes did not work with me. As it appears with me every time the plane that I chose the first time. For example, I chose Boeing 787 the first time and I want to choose another plane such as the hypothetical Cessna that refuses that and appears with me in the previous flying game, Boeing 787. I tried to solve the problem of re-downloading the program again, but without any result. I hope to find a solution to this problem

PLEAS solve my proplem