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This is Highly unlikely Because they are being monitored by a tower in which tells them where to go and when to turn. Also they have a radar in which scan for other air planes in the air. Hope this helps.
When you curve the line you are travelling you are no longer going directly from one point to the other. If you want to go from one point to another you would want to go directly to the second point.
The gradient is a measure of steepness from one point to another.
If you're only given one point, you can't draw the graph of the line, because there are an infinite number of different lines that all go through that one point. Or, to put it another way, if someone gives you a single point and asks you to draw the line through it, you can draw any old line you want through that point, and nobody can say it's wrong. In order to pin it down to one unique line, you need another piece of information in addition to the one point: either the slope of the line, or another point.
Two planes intersecting could look like an X and then a third one could go right down the middle.