Across all services, no fly fridays are common. This is because they don't want air crews to break crap on Friday afternoon which require the maintenance guys to work through the weekend. This way, everyone tends to get their weekends off. But... hundreds of air crews have been working non-stop. Likewise, lots of equipment is now transporting via train. We've got non-stop air tankers crossing the country, which is commonly done when you want to refuel shorter range aircraft without them landing.