FAA lost phone , radar service ; serviced restored at 13 p.m . ET Tuesday . Doug Church , a spokesman for the National Air Traffic Controllers Association , called the failure `` a major safety problem . '' Air controllers could not communicate to hand off control of flights , FedEx said . `` Significant delays '' at Dallas - Dallas ; Memphis ; Charlotte , North Carolina . FedEx , based in Atlanta , diverted its aircraft to other cities , spokesman said .
FAA lost phone , radar service ; serviced restored at 13 p.m . ET Tuesday . Air controllers could not communicate to hand off control of flights , FedEx said . `` Significant delays '' at Dallas - Dallas ; Memphis ; Charlotte , North Carolina . FedEx , based in Atlanta , diverted its aircraft to other cities , spokesman said .