Lansing
Jewell Village, Indiana is the halfway point from Lansing, MI to Columbia, TN. The closest major city that is roughly halfway is Indianapolis, IN.
Marion, OH.
Manchester, TN
The halfway point between East Lansing, MI, and Macomb, MI, is roughly near the area of Lansing or the outskirts of the city. Specifically, it could be around the region of the city of Haslett or the southeastern part of Lansing, depending on the route taken. This midpoint provides a convenient meeting spot for travelers coming from both locations.
Manchester
Manchester, TN
I'm going to assume you're in Michigan and you meant to type Lansing. The halfway point is Farwell.
The halfway point is just west of Iowa City, Iowa.
West Manchester, Ohio
Berea, Kentucky is almost exactly the halfway point.
The halfway points are the points which mark the half distance covered by the flight. These lie in the mid of both the above mentioned places. These points change for different locations. Halfway points for the above mentioned places are - Northampton.