They generally drop you off at their office location but I believe you can pay extra to get dropped off/picked up anywhere.
The airport is located about 14 minutes away from where their office is. Normally, all shuttles go in and out of the main office. They do provide taxi services in the St George area, and im sure that you can negotiate with St George Shuttle to assist you getting to the airport if needed. Otherwise, you wouldnt interact with the location of the airport at all.
Thanks for the info
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