@Koitenshin actually it's because you did it too slow. If you look on the top right of the screen when your playing it shows how much time is left. So, the amount of time they show when you see how fast you did it, is actually the amount of time left
My plane went 400 miles in 1 minute...... that's like faster than our planes. It seems the new era of transportation has arrived. The era of ... paper. :D