You can,

Step one, crop to the desired aspect ratio. I personally use 16x9 for most things, however, it depends on the image and framing.
Step two, in lightroom, press the 'o' key until reaching the cropping grid which looks like a mesh, as seen in the image below.
Step three, find the centre point of the grid and try to line it up with the middle of the aircraft, depending on the angle, I usually try to line the centre point up with the aircraft's windows, or thereabout. It all depends on the image. For the Cessna, I'd personally find the middle point in line with the top of the 'N' on the registration.

This is how I personally crop, hopefully, this helps.

...