EXHIBIT 23.1 The Board of Directors Innovative Solutions and Support, Inc. We consent to the incorporation by reference in this Registration Statement of Innovative Solutions & Support, Inc. on Form S-8, of our report dated December 10, 2003, appearing in the Annual Report on Form 10-K of Innovative Solutions & Support, Inc. for the year ended September 30, 2003. /s/ DELOITTE & TOUCHE LLP Philadelphia, Pennsylvania February 26, 2004