A nationwide ground stop prompted by a communication failure at air traffic control centers left travelers stranded at Omaha's Eppley Airfield on Friday afternoon, delaying and canceling flights as travelers — and airlines — scrambled to rearrange plans. kAm%96 u656C2= pG:2E:@? p5>:?:DEC2E:@? @C56C65 2== 56A2CE:?8 7=:89ED 24C@DD E96 4@F?ECJ 8C@F?565 D9@CE=J 367@C6 b A]>][ 4:E:?8 E96 4@>>F?:42E:@?D :DDF6] !=2?6D 2=C625J :? E96 2:C H6C6 2==@H65 E@ =2?5[ 3FE E9@D6 @?