Exhibit 4 STOCK PURCHASE AGREEMENT This Stock Purchase Agreement is entered into as of August 25th, 2003 between Iowa Great Lakes Flyers, Inc., an Iowa corporation (the "Purchaser"), and Gayle R. Brandt (the "Seller"). WHEREAS, Douglas G. Voss...Stock Purchase Agreement • September 18th, 2003 • Great Lakes Aviation LTD • Air transportation, scheduled • Iowa
