Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS September 30, 1999 Expected B Maturity 6/17/02 Blended Coupon 6.4784% Excess Protection Level 3 Month Average 6.02% September, 1999 5.91% August, 1999 6.03% July, 1999 6.12% Cash Yield 18.00% Investor Charge Offs 4.60% Base Rate 7.49% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate 14.16% Total Principal Balance $45,780,732,257.76 Investor Participation Amount $706,000,000.00 Seller Participation Amount $3,198,912,739.27