Exhibit 99.15 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS May 31, 2001 Expected B Maturity 3/15/04 Blended Coupon 4.2838% Excess Protection Level 3 Month Average 7.85% May, 2001 7.78% April, 2001 7.60% March, 2001 8.18% Cash Yield 19.67% Investor Charge Offs 5.45% Base Rate 6.43% Over 30 Day Delinquency 4.84% Seller's Interest 8.52% Total Payment Rate 14.20% Total Principal Balance $58,203,705,030.43 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,958,014,468.94