Travelers who are susceptible to motion sickness can minimize symptoms by:
Choosing a window seat with a view of the ground or of lower clouds, such that motion can be detected. This will not work if the plane is flown in the clouds for a long duration.
Choosing seats with the smoothest ride in regards to pitch (the seats over the wings in an airplane). (This may not be sufficient for sensitive individuals who need to see ground movement)[1]
Sitting facing forward while focusing on distant objects rather than trying to read or look at something inside the airplane.
Eating dry crackers, olives or suck on a lemon, to dry out the mouth, lessening nausea.
Drinking a carbonated beverage.