Why is my Airplane not following the Custom Path?

Hi everyone, I'm a complete newbie so bear with me.

I have a custom path drawn with a gradual slope for an airplane to take off. I'm having a few problems:

  1. Why is the plane "popping" off the ground instead of following the gradual slope of my custom path?
  2. I noticed when I pull up the last part of my custom path for the slope, part of my custom path warps to go underground. Why is that happening?
  3. Why does it look like my plane is falling from the sky when it starts the loop over?

Plane_Takeoff_AdobeCreativeCloudExpress_AdobeCreativeCloudExpress

Thanks for any help!

I found the solution in case anyone is wondering in the future. All I had to do was turn "Physics" off in the object settings of the airplane. Very easy fix.