to you. >>> well, hundreds of the american airline pilots are taking vacation this is holiday season. good for them. you may not be taking a vacation if a computer glitch left thousands of flights, without pilots. >> "eyewitness news" reporter trang do has more on the scheduling snafu that caused this mess. she's live at philadelphia international airport with the details, good morning, trang do. >> reporter: good morning, rahel and jim. philadelphia international airport is a hub for american airlines so they operate dozens of flights out of here daily so with this shortage it could result in thousands of upset passengers come this very busy christmas travel season. world's biggest airline has a big problem, a scheduling glitch allowed too many american airlines pilots to schedule time off at the end of the year which could ground thousands of flights for people heading home for the holidays. >> real bad, holiday coming, we have new years coming, christmas coming so people will be...