How far is Lansing (Michigan) from Mount Pleasant (Michigan)? Here's the quick answer if you drive this relatively short distance without making any stops.
Now let's assume you have a private jet and you can fly in the fastest possible straight line between Mount Pleasant, Michigan and Lansing, Michigan. Because of the curvature of the Earth, the shortest distance is actually the "great circle" distance, or "as the crow flies" which is calculated using an iterative Vincenty formula.
Let's say you're actually planning a road trip to Lansing (Michigan), and you want to stop on the way to explore. If it's a real road trip, you might want to check out interesting places along the way, or maybe eat at a great restaurant. That's what Trippy is perfect for, helping you figure out travel plans in detail.
In the quick calculation above, we assumed you had a private plane and just wanted to know the time in the air from city to city. But for most of us, we're going to be flying on a commercial airline (whether it's first class or coach).