Passengers of Delta Air Lines' international flights will soon be seeing lots of red tags.

Starting this weekend, the Atlanta-based airline is issuing the red tags to keep track of approved carry-on luggage.

Spokeswoman Betsy Talton says the purpose of the new plan is to maximize overhead compartment storage space for passengers.

She says there are no plans in the works to use the tags for domestic flights.

Delta officials will place the red tags on carry-on luggage at the check-in counter or the gate.

The airline currently allows each passenger to bring aboard one piece of luggage with total length, width and height dimensions of no more than 45 inches and a maximum weight of 40 pounds.

Passengers may also bring aboard another small item, such as a briefcase, purse or tote bag.