For the FBO business, 2013 may go down as the year the industry truly began its slow, tentative climb out of the trough. U.S. business jet activity, both domestic and international, rose over 2012, which in turn saw a modest gain over 2011. At almost 3.4 million operations, domestic activity last year increased by 2.4 percent, according to the FAA, an improvement of more than 79,000 operations but still 19 percent lower than the record high of 4,191,692 operations set in 2005. International operations last year reached record levels at 677,822, an increase of nearly 2 percent over the previous year.