Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS August 31, 2000 Expected B Maturity 6/17/02 Blended Coupon 6.6647% Excess Protection Level 3 Month Average 5.59% August, 2000 5.65% July, 2000 6.11% June, 2000 5.02% Cash Yield 19.12% Investor Charge Offs 4.51% Base Rate 8.95% Over 30 Day Delinquency 4.84% Seller's Interest 10.94% Total Payment Rate 14.32% Total Principal Balance $55,220,806,818.68 Investor Participation Amount $706,000,000.00 Seller Participation Amount $6,039,606,300.19