The plan:  drive from Huntsville to Atlanta.  Obtain Gareth, whose current sojourn in the States has not yet produced the need for a rental car.  Drive Gareth back to Huntsville, so that he can have some face time with the locals over a three-day weekend.
Message window, Gareth, yesterday afternoon:  "Greg has proposed I-20 exit 51a at 7:30pm EST - there's a McDonald's there apparently."