Given a callsign such as 'VRS1', where VRS is an airline whose IATA code is VR, this returns all possible alternate callsigns by introducing leading zeros - e.g. 'VRS1, VRS01, VRS001, VRS0001, VRS00001, VR1, VR01, ..., VR000001'

List<string> GetAllAlternateCallsigns(
	string callsign
)

Function GetAllAlternateCallsigns ( 
	callsign As String
) As List(Of String)

List<String^>^ GetAllAlternateCallsigns(
	String^ callsign
)

abstract GetAllAlternateCallsigns : 
        callsign : string -> List<string>