Weight limit was 50 lbs. with no more that 100 lb total going from the same shipper to one consignee per day.
I started as a loader in 1975, and I remember the 50 lb. limit and those drop-frame trailers. You haven't felt pain until you had a trailer flap drop on your head! I worked on the Midnight Sort. If a Blue Label package was left at the end of the sort, then somebody would drive to the airport and it was line-flighted on the next plane out. It was a good PT job then. The starting pay was $4.25 an hour compared to $2.10 an hour that was the minimum wage that the fast food places would pay a teenager like me.
When I started driving in '84, Next Day Air was fairly new. I learned to record on paper, we used Delivery Records until DIAD 1 came out about 1991. I remember we had those tear off NDA labels and a 3PM Commit Time. I had an Industrial Park and I ran them first. I could have ran them with trace, my van was empty by 2:30 and then I would blow it out with Pickups.