NEW : The St Louis mayor says the airport is closed indefinitely . ( CNN ) -- ` ` The plane was rocking back and forth , '' one witness says . CNN affiliate KSDK : The tornado ripped off part of a wing at one point . Passengers are hit with flying debris and debris , KSDK says .
NEW : The St Louis mayor says the airport is closed indefinitely . ` ` The plane was rocking back and forth , '' one witness says . CNN affiliate KSDK : The tornado ripped off part of a wing at one point . Passengers are hit with flying debris and debris , KSDK says .