NEW : The National Transportation Safety Board told CNN the agency was `` aware '' of the Southwest Airlines alert , but would not comment further . FAA spokeswoman says it does n't appear issue was related to crash . Warning concerned runway 23 , the same one the crashed plane was lined up to use . Comment:
NEW : FAA spokeswoman says it does n't appear issue was related to crash . Warning concerned runway 23 , the same one the crashed plane was lined up to use . Comment: