AirlineFlightSchedules flightno problem

Hello!

I’m trying to use your Flight XML api and I have encountered with a problem.
Method AirlineFlightSchedules has flightno STRING parameter.
When I’m sending request


flightxml.flightaware.com/json/FlightXML2/AirlineFlightSchedules?startDate=1405296000&endDate=1405382399&flightno=DAL5901

server respond


{error: "flightno must only be numeric»}

What the problem? I thought It is string parameter?

The “flightno” argument should be just the numeric portion “5901”. The “DAL” should be specified in the “airline” argument.

The argument is defined as string rather than integer for technical reasons.