i went to buy my ticket for travelling to Japan in July. i was debating whether i should purchase or use mileage. Air Canada cost about $700, while Delta cost about $1100. it took me about 5 minutes (or less) using the web to find and purchase the ticket from Air Canada. on Delta, i was on hold for about 15 minutes and then a lady fumbled around for another 15 minutes before my phone finally died. Delta would have charged me for a round-trip ticket had i used mileage, even though i was only buying a one-way. granted, the Delta manuver was more complicated (since it was through a “partner”) airline, but my money was not forgiving.