<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by RobertS975:
Does anyone have a clue as to why Song has been excluded from the alliance? </font>
Song flights are intented to be sold as standalones and cater to point-to-point traffic rather than hub-connection traffic that is the basis for the alliance. Song also does not interline or connect baggage (except at JFK to/from DL Europe flights).