A new report says airlines slipped last year in getting passengers' checked luggage to arrive on time.

Worldwide, 29.4 million bags last year didn't arrive on the same flight as their owners, according to SITA, an aviation communications and technology provider. That's 12.07 mishandled bags for every 1,000 passengers, a 6 percent increase over 2009.

European airlines led the decline while U.S. carriers saw a slight improvement.

The rise in baggage problems is attributed by SITA to more passengers flying, as well as major travel disruptions from severe winter weather and the ash cloud from an Icelandic volcanic eruption that grounded a large portion of European air traffic in April.