WASHINGTON, Sept 20 (Reuters) - Operations at Dallas

Fort Worth and Dallas Love Field airports have returned to

normal levels, the Federal Aviation Administration said on

Saturday,

The FAA said it was working with airlines on recovery plans

to support impacted flights.

"Yesterday's disruption was caused by multiple failures of

the TDMI data telecommunications service provided by Frontier, a

local telecommunications company," the FAA said in a statement.

"This then led to an outage impacting the FAA's Dallas TRACON

facility."

Earlier, American Airlines ( AAL ) said it had canceled 690

flights since Friday, impacting 100,000 customers because of the

Dallas-area telecommunications outage.