In the meantime, the hotel business continued to soar. With the best known and most respected name in the industry—and popular domestic brands ripe for expansion overseas—Hilton Hotels Corporation proved to be irresistible to The Blackstone Group. In 2007, the private equity firm purchased Hilton Hotels Corporation, consisting of 2,800 hotels with 480,000 rooms in 76 countries and territories. Blackstone paid $47.50 per share, a 32 percent premium over the July 2 closing price. The $26 billion, all-cash transaction included $7.5 billion of debt.
On December 25, 2007, Hilton announced that he would follow in his father's footsteps by leaving about 97 percent of his estate, estimated at that time to be $2.3 billion, to the Conrad N. Hilton Foundation. Included was an immediate pledge of $1.2 billion, the proceeds of the sale of Hilton Hotels Corporation and Harrah's Entertainment Inc., which was placed in a charitable remainder unitrust that would be transferred to the foundation upon Hilton's death at whatever value the trust was worth at that time. The remainder of the funds that constitute Hilton's pledge of 97 percent of his estate will come from his personal assets, which were estimated at $1.1 billion at the time.
On Labor Day, 2007, Fossett took off from the Flying M Ranch and never returned, perishing in a crash in the Sierras. In spite of an intensive search, the wreckage wasn't discovered until the following spring. The National Transportation Safety Board determined the probable cause(s) of this accident to be "the pilot's inadvertent encounter with downdrafts that exceeded the climb capability of the airplane. Contributing to the accident were the downdrafts, high density altitude, and mountainous terrain." Examination of the airframe and engine revealed no evidence of any malfunctions or failures that would have prevented normal operation.