One passenger suffered an ear injury when a SkyWest flight suffered a loss of cabin pressure Thursday, forcing an emergency landing in Milwaukee.  The Delta Connection flight had left Cedar Rapids and was headed for Detroit.  Thirty-eight passengers and three crew members were on the flight which landed safely at Mitchell International Airport.  The female passenger was taken to a hospital, where she was checked out, then resumed her trip.  SkyWest workers were investigating the loss of cabin pressure.  Passengers were switched to another plane and the flight left for Detroit six hours later.