Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS September 30, 1998 Expected B Maturity 6/17/02 Blended Coupon 6.5129% Excess Protection Level 3 Month Average 5.39% September, 1998 4.47% August, 1998 6.40% July, 1998 5.30% Cash Yield 17.36% Investor Charge Offs 5.18% Base Rate 7.70% Over 35 Day Delinquency 5.04% Seller's Interest 13.10% Total Payment Rate 13.10% Total Principal Balance $39,849,511,082.92 Investor Participation Amount $706,000,000.00 Seller Participation Amount $5,219,716,564.43