NEW : Greyhound Lines scrubbed at least 1,700 flights Tuesday . NEW : Flight-tracking website says 500 flights were canceled . American Airlines 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 : Flight-tracking website says at least 1,700 flights were canceled . Greyhound Lines also affected by snowy roads , windy conditions . Travelers encouraged to check status of flights , bus , trains before leaving home .