Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS June 30, 1999 Expected B Maturity 3/15/04 Blended Coupon 5.1467% Excess Protection Level 3 Month Average 6.02% June, 1999 5.22% May, 1999 7.65% April, 1999 5.20% Cash Yield 17.44% Investor Charge Offs 5.06% Base Rate 7.15% Over 30 Day Delinquency 4.82% Seller's Interest 11.01% Total Payment Rate 13.71% Total Principal Balance $44,380,968,357.42 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,888,448,838.93