[quote name='mr_bungle']My SSFIV and 3DS shipped yesterday at 1 and 3PM, respectively. They both have a delivery estimate of 3/29, but I paid for overnight on the 3DS, and at UPS it says 2nd day air. If my 3DS isn't here tomorrow, I'm contacting amazon. Not because I have to have it, but because I paid 3.99 for next day air, not 2nd day air.[/QUOTE]
overnight shipping means they ship it monday and you get it Tuesday. Product releases Sunday, it ships monday, you get it tuesday.
However they actually manage it and by whatever carrier they use doesn't matter. They are obligated to deliver it on Tuesday, not Monday. Some people just got extremely lucky with their orders.
Even if they shipped it out 3 weeks ago by rented mule, as long as you get it Tuesday, they've "overnighted" it to you.