BOSTON (AP) — Once seen as a luxury of the corporate world, private planes are becoming increasingly common at U.S. colleges and universities as schools try to attract athletes, raise money and reward coaches with jet-set vacations. The Associated Press requested documents from dozens of public universities and found that at least 20 own or share ownership of planes for school business, often employing a few full-time pilots to fly them. At Ohio State University, which leases one plane and partly owns another, football coach Urban Meyer and members of his family took 11 personal trips last school year, including a vacation in Florida, a weekend getaway to Cape Cod and a spring break in South Carolina. Colleges defend the costs, saying coaches and top administrators need to travel more than ever, while commercial airlines are offering fewer flights. Universities often use planes for athletic recruiting, mostly football and basketball, and to shuttle administrators on trips to woo donors or lobby lawmakers. Purdue University, for example, sent a plane to Providence, Rhode Island, last year to bring alumnus and former NFL lineman Matt Light to Indianapolis for an athletics meeting and then flew him back, at a cost of $15,000. Last year, the University of Minnesota found that men's basketball coach Richard Pitino had overspent his budget for chartered flights by more than $200,000 over three years. [...] the school has hired a new athletic director whose job will partly be to rein in the budget. Iowa State University President Steven Leath, a pilot, acknowledged last year that he used a school plane for trips that mixed personal and university business, a practice that came to light after he damaged the aircraft in a hard landing.