Prio Mail - how long can it take?

Mailed a Prio Mail Small Flat Rate box Monday, CO to NY. As of Friday, it still hadn't arrived. No record in Deliv Confirmation, however a call to 1-800-ASK-USPS showed it's "in the system."
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It seems that if you mail it out on a Friday- it is there by Monday, at least that has been my past experience over the last couple of months..
<< <i>'Tis the season... >>
My thoughts exactly.
This week and next are peak time for gifts traveling by the USPS. Expect delays.
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caught in the drifting snow.
Yep, 'tis the season
bob
<< <i>Gee, didn't a BIG storm just leave CO for NY. I think your package was just
caught in the drifting snow. >>
Good thought, but the storm was a non-event in Denver. Doesn't Prio Mail go by air? If so, it should have flown over and beat the storm to the east coast.
In any case, just got notification that the package arrived today - 6 days (ahead of schedule according to USPS!)
Scheduled for Delivery: Monday, December 14, 2009
Class: Priority Mail®
Service(s): Delivery Confirmation™
Status: Arrival at Post Office
Your item arrived at 9:31 AM on December 12, 2009 in NEW YORK, NY 10003. Information, if available, is updated periodically throughout the day. Please check again later.
Detailed Results:
Bullet Arrival at Post Office, December 12, 2009, 9:31 am, NEW YORK, NY 10003
Bullet Electronic Shipping Info Received, December 06, 2009 (edited to add - picked up by mailman on 12/7)
<< <i>'Tis the season... >>