Generally speaking, airplanes are louder during landing than takeoff. The difference can be especially noticeable with commercial jet aircraft when comparing the same aircraft type in the takeoff and landing phase of flight.  Landing aircraft usually overfly the community at lower altitudes as they line up with the runway and prepare to touchdown, bringing them closer to residents on the ground. Configuring the plane for landing requires the pilot to lower the landing gear and wing flaps which enables the airplane to slow down and the wings to generate greater lift. However, the noise generated by the turbulent airflow over the landing gear and flaps also creates substantial noise that can equal or exceed that produced by the jet engines.  The turbulent airflow also increases the drag on the airplane requiring the pilot to increase engine power to maintain a safe descent path to the runway, which also increases noise. 

Dallas/Fort Worth International Airport doesn't have the legal authority to levy a fine or otherwise penalize any aircraft operator for the amount of noise their aircraft make.  Only airports in the United States that had noise-based operating fines in place before the Airport Noise and Capacity Act (ANCA) was enacted in 1990 are allowed to extract financial penalties from operators based on airplanes exceeding specific noise thresholds at their airport.

For safety reasons aircraft always land and take off into the wind.  A headwind decreases the amount of runway needed for an airplane to take off and land by increasing the amount of airflow over the wing, which increases lift, allowing the plane to land or take off at a slower airspeed.  As a general rule, when the wind speed at the airport is measured to be six knots or higher, the prevailing direction of the wind dictates which runways are used for landing and takeoff.

The Federal Aviation Administration (FAA) Air Traffic Control (ATC), not DFW has sole authority and responsibility for routing and separating air traffic across the national airspace system.  ATC's priority is the safe and efficient movement of aircraft through the sky above the United States.  Because DFW is part of a much larger and complex airspace system movements of aircraft within the Dallas/Fort Worth metroplex must be carefully coordinated with other control areas to ensure the safe flow of all planes, this can occasionally result in aircraft being required to deviate from established flight paths to ensure the safety of all airplanes operating in the sky.