Reader Colin says he just got charged for his first checked bag on Northwest Airlines:

I just checked in at Denver International to find that NWA is charging $15 for the first checked bag, used to be free. Skycap said this just started today. Looks like I picked the wrong day to fly.

The Skycap is correct, today is the first day that Northwest is charging for the first checked bag.

From the Detroit Free Press:

The fees will be waived for certain passengers:

• Those who bought their ticket before July 10.

• Those who are traveling internationally.

• Those who are Elite, first-class and World Business-class passengers.

If you bought your ticket before July 10, don't let them sock you with this fee.

NWA's bag fees start Thursday [Detroit Free Press]
(Photo: So Cal Metro )