The delivery tiers
Next day air usually comes in tiers: early morning, mid-morning and end of day. The earliest tier costs the most, and the end-of-day tier costs the least.
Residential deliveries may arrive later than commercial ones in the same tier. The right choice depends on when the item is actually needed, not on habit. Paying for early morning only makes sense when someone is waiting for it at the start of the day.
AirFreight.com steps in when a shipment outgrows those tiers. Every shipment is monitored from pickup to delivery.