You can get a list of all flights arriving at a given airport by selecting the By Airport tab. Or you can see a list of all flights on a given route by selecting By Route. You can usually determine which flight you should track from the route and timing information.
A square is a regular polygon. It has four lines of symmetry and four sides. A regular pentagon has 5 sides and 5 lines of symmetry. The number of lines of symmetry in a regular polygon is equal to the number of sides.
The circle has infinitely many lines of symmetry, any line going through the center. (Any diameter is a line of symmetry.) The parallelogram pictured has no lines of symmetry. Neither does the trapezoid. Each regular polygon has as many lines of symmetry as it has sides.