Published: Aug 01, 2010 9:17 PM EDT
Updated: Aug 01, 2010 6:17 PM EDT

NEW YORK (AP) - Spirit Airlines says it is gaining ground in the fight against flight delays with its controversial move to charge for carry-on bags.
      
The new fees took effect Sunday. Spirit spokeswoman Misty Pinson says initial signs look promising.
      
Since airlines started charging for checked luggage, more flyers have brought carry-on bags on board. Spirit's new fee is aimed at discouraging passengers from stuffing the overhead bins because it often takes extra time to get bags settled.

Spirit is charging $30 at check-in for any bag that's too big to fit under the seat. The price goes up to $45 for passengers who wait until they get to the boarding gate to pay.

"The check-in process is going well so far," Pinson said Sunday afternoon. "It looks like this is going to speed things up."