1/1/2021 Update: US Mail is still running behind but not as bad as mid December. If you need your diagram(s) in 5-7 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 3-4 business days or less, rest of continental US in 6-7 business days at most. US Mail options still available, but delivery will take longer (days or weeks) as they work through their backlog of earlier shipments and deal with COVID staffing issues.