Yes, they are flying! Living outside DC, I saw this type of motorcade once for Bush 43 when he came to DHS in McLean, Virginia
I was traveling back from DC on I-270 near Frederick, MD, when I looked in the rear view mirror and saw lots of flashing lights approaching. I pulled to the side of the four lane (each way) highway, and seconds later a fleet of SUV's and vans went by with Clinton's large in the middle of about 15 vehicles. they were doing close to 100MPH heading to Camp David cause the weather wasn't conducive to Marine1!
I look forward to seeing the same with President Trump!