public ITuple isRunwayFreeForTakeoff(string planeCredentials, int runwayNr)
{
Console.WriteLine(planeCredentials + " is at runway " + runwayNr + " and trying to get takeoff clearance");
ITuple freeRunwaySpace = runwaySpace.GetP("Runway Nr.", runwayNr);
return(freeRunwaySpace);
}