Flight number parser

FlightNumParse.cs

public static (string airline, string number) Parse(string flightNumber)
{
	string airline = "", number = "";
	flightNumber = flightNumber.Trim().Replace(" ", "");

	for (int i = 0; i < flightNumber.Length; i++)
	{
		char c = flightNumber[i];
		if (c > 64 && string.IsNullOrEmpty(number))
			airline += c;
		else
		{
			if (i <= 1)
				airline += c;
			else
				number += c;
		}
	}

	return (airline, number);
}