Boosted by an all-time earnings record at its CityCenter development and its best-ever first quarter in Macau, MGM Resorts International shifted from the red to black for the quarter that ended March 31. The Las Vegas-based company today reported net income of $22.6 million, 1 cent a share, on revenue of $2.54 billion. That compared to a first-quarter loss of $203.3 million, 44 cents a share, on revenue of $2.47 billion for the same quarter a year earlier.