March 21 - Applied via local passport site (not a USPS location and required driving about 45 minutes away to one that didn't require appts) - Told them that we needed them for travel on April 15th. I believe this facility charged for priority mailing.
March 29 - Received notice when checking the status online that it would arrive by April 6th
April 1st - Received 3 new passports, did NOT pay for expedited
April 6th & 8th - Received birth certificates and expired passports back


Another adult had a different experience:

March 27th - Mailed in a passport renewal and listed May 4th as the deadline for when it was needed. Not mailed via priority.
April 5th - Still showed as processing without an expected date to receive it
April 5th - Paid to have it expedited
April 6th - Received email saying that it was being processed without expedited service
April 8th - Verified with the passport office that it is listed as expedited in their system even though we can't view that terminology on our end
April 9th - Finally shows in the system as expedited, but still doesn't have a date for arrival

Edit: April 11th - Estimated delivery of April 13th via Express mail!