Flight number returns result but without does not?

Hi guys,

I am using the AirlineFlightSchedules call and have a start & end date, origin & destination, howmany is 100.

However when running this is seems to be missing out a few flights? And is only returning 15 results even though I specified more.

The strange thing is if I use the same parameters and add in flightno it returns the results?

To receive more than 15 results from any FlightXML function you must first opt-in to larger results by calling SetMaximumResultSize. The value you specify for howMany can then be less than or equal to the max_size that you specify.