2 or 3 years ago, I requested that you differentiate express shipping on the system. Adding the flame graphic to emails and the order list helped. Great additions. To further help us catch express shipping, adding it to the packing list, so shipping people see it would also be a benefit. I stamp each order with "Express " in red ink. It is easy to miss stamping the packing list as nothing on it differentiates it from ground shipments, especially in a stack of orders.
To help us make sure we ship these express shipment quickly, being able to opt in for a text message just to make sure we get the message quickly would be a good addition. I can look at texts more often than emails. It is common for me to drive over to the shipping department at 12:00 with an express order to get it on the truck.
From the buyers point of view, they have no idea how fast a seller will ship an expedited shipment.
Right now, the buyer looks at score metrics to try to determine how fast the seller will ship the order.
Basing a decision on ground shipment handling times (score metric) is not real good info to base the decision on, especially with the price of expedited shipping . Adding either historical expedited shipping handling time for the last year or a shipping deadline from the seller for same day shipments would give buyers solid tools they could make decisions around.