Most airlines IRL use Flaps 30 as the standard. It would go something like (1/5/15/25/30) 40 is used when there are higher wind conditions of the sort to try and stablize the aircraft on approach.
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The use of flaps and slats on the leading edge of the wings alters the aerodynamic qualities and camber of the wings allowing more lift to be created at lower airspeed which shortens the takeoff roll. No commercial aircraft would attempt to takeoff or land without flaps extension.
With necessary runway requirements at just over 6000 feet, the 737-200 is able to access a great number of additional airports in comparison to its competition in the class. The average hourly rental rate of the Boeing 737-200 is around 18,300 USD per hour.
In aviation, the rule of three or 3:1 rule of descent is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. For example, a descent from flight level 350 would require approximately 35x3=105 nautical miles.