CANADA 1928,  Scott 142, CL42 on 1928 Yukon Airways First Flight Cover.  First Flight, white Horse YUKON, British Columbia to Carcross, Yukon.   AP 13 28 / B.C. CDS & light grid ties 25c blue Yukon Airways & 2c green Federation to First Flight envelope.  Reverse: Carcross receiver CDS.  Canadian Air Mail Catalogue CL42-2801g.