This is great! An example of an earth satellite with highly elliptical orbits is Molniya orbits mentioned here https://earthobservatory.nasa.gov/Features/Orbit

This is great! An example of an earth satellite with highly elliptical orbits is Molniya orbits mentioned here https://earthobservatory.nasa.gov/Features/OrbitsCatalog https://earthobservatory.nasa.gov/Features/OrbitsCatalog