1/25/2021 Update: US Mail is still running behind but nowhere near as bad as mid December. If you need your diagram(s) in 5-6 days please select UPS at checkout. We have negotiated a flat rate of $9.95 per shipment. (Residential & Extended Area surcharges are included) East of the Mississippi should receive items in 2-4 business days or less, rest of continental US in 4-7 business days at most. US Mail options still available, but delivery will take longer (days or a week +) as they work through their backlog of earlier shipments and deal with COVID staffing issues.