Currently only one Stateside air flight service a day -- the AA from Miami landing mid afternoon. NO other airline has service to STT from the mainland. I certainly doubt the airlines will be in a rush to start scheduling flights and May 20 seems like that would be rushing it.
You can read the Governors Facebook page - for current info -- open to all.

https://stthomassource.com/

https://www.facebook.com/GovernmentHouseUSVI/?__tn__=%2Cd%2CP-R&eid=ARDZ93AFMW-Of14qV4PUuOr4EjRqXC7lUnOnc2XjlQ705eVpKOQ8cOLoAaIhEHaB2DAufsgR0W2EJS45