"Mazda has decided to expand the area of the high-temperature, high-humidity region recall to include the Gulf Coast states," the company said in a statement.
The recall now includes Texas, Louisiana, Mississippi, Alabama and Georgia, as well as Guam, Saipan and American Samoa. The previous area included Florida, Puerto Rico, Hawaii and the U.S. Virgin Islands.
As of December 4, the estimated number of vehicles in all Mazda-Takata campaigns is 86,773.
It is unclear whether consumers will encounter parts shortages, but Mazda said it is in discussions with Takata to "move forward the supply timing for replacement airbags."
It added: "We continue to encourage customers to respond to our recall by making phone calls and resending notification letters. With safety as our first priority, we are cooperating with Takata to work toward finding a solution to this problem as early as possible."
The defective Takata airbag inflators can explode and spew shrapnel into the car, posing a serious risk to vehicle occupants.
Mazda said it has agreed to join an initiative begun by Toyota for independent, industry-wide joint tests of Takata airbag inflators.
"This situation is fluid and updates will be provided regularly," Mazda said.
Edmunds says: At this point, affected Mazda owners should stay in touch with their dealer for next steps.