NEW : American Airlines scrubbed 500 flights Wednesday . NEW : The FAA has grounded all of its planes for the rest of Thursday, and will continue to do so until further notice. Amtrak listed only one service disruption , because of a mudslide in the Pacfic Northwest , on amtrak.com . Greyhound Lines also affected by snowy roads , windy conditions . Travelers encouraged to check status of flights , bus , trains before leaving home .
NEW : American Airlines scrubbed 500 flights Wednesday . NEW : The FAA has grounded all of its planes for the rest of Thursday, and will continue to do so until further notice. Greyhound Lines also affected by snowy roads , windy conditions . Travelers encouraged to check status of flights , bus , trains before leaving home .