My travel guru/buddy “Hey Dar” points out Delta is boasting that they screw up a lot on baggage, since the bags are supposed to be on your flight. In case you missed this news around the Thanksgiving holiday, Delta says it’s the first U.S. airline to add baggage tracking to its app for smart phones and mobile devices. Delta says its Delta mobile app now allows customers to track their checked luggage. The app currently is available for Android, Windows and and iPhone devices. Delta says it expects to have a BlackBerry version available in “early 2012.” The mobile-device app…