Does anyone know what "ground connection" in the travel agency means?

"Land agency" is a local travel agency.

The history, culture and customs of different places are different, so foreigners naturally don't know as much as locals. So generally speaking, a travel society seeks cooperation from some travel agencies around the world. The travel agency at the starting point sends a team leader to accompany the tourists all the time, which is called "full escort". When you arrive at your destination, the Land Agency will send a guide to show you around. This tour guide is called "local escort".