AirNet Systems Inc. announced Friday that Joel E. Biggerstaff had resigned as chief executive and was to leave the board and his post as chairman this past Sunday.

The Columbus, Ohio, airline, the nation's largest courier of canceled checks, said Mr. Biggerstaff would be retained as a consultant in 2007 "to ensure a smooth transition and provide valued counsel."

Mr. Biggerstaff, who joined the company in 1999 and had been CEO since 2001, had been a target of dissident shareholders who said he failed to position AirNet for the decline of checks and for banks' shift to image clearing and other electronic payment methods. (AirNet planes also deliver American Banker.)

AirNet's press release said Bruce D. Parker, 59, had assumed the roles of CEO and chairman immediately upon Mr. Biggerstaff's resignation. Mr. Parker, a director of AirNet since 2002, is the managing director of IT Management Group LLC.

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