Major League Baseball (MLB) made announcement that they plan to expand from 4 to 13 teams to accept Apple’s Passbook mobile ticketing app.  Last September, it was only for San Francisco Giants, New York Mets, Boston Red Sox and Kansas City Royals.  This summer, they will add Baltimore Orioles, Chicago Cubs, Detroit Tigers, Milwaukee Brewers, Minnesota Twins, Oakland Athletics and Pittsburgh Pirates.  There are other three more teams will like to support the app however they are not yet ready to make it official.  It seems that they are getting better with Passbook app and hopefully other teams will be added in the future.