seems cheap vs expensive F/J, as mentioned F/J dont always skip queues
(let alone avoiding commercial terminal completely when that is the case)
from source >
Signature Flight Support, a network of over 100 private jet terminals around-the-world, often referred as FBOs
Right now a spokesperson for BBA Aviation, the parent of Signature said the expansion plan is to “hopefully” add the service for commercial passengers at Edinburgh and Antigua in the “near future.”
Jonna Mercercox, Station Manager for Signature at Gatwick told Forbes.com, “This is a very welcomed service at LGW and one we hope to be able to provide at other bases within the Signature network.”
from signature site >
The Grenada jet centre extends elegant St. George’s Suite service to guests traveling on British Airways, Virgin Atlantic, American Airlines and other leading airlines.
AA - so presumably not limited to flights from LGW