Exhibit 99.51 MBNA MASTER CREDIT CARD TRUST II SERIES 2001-A KEY PERFORMANCE FACTORS May 31, 2001 Expected B Maturity 02/15/2006 Blended Coupon 4.3553% Excess Protection Level 3 Month Average 6.31% May, 2001 7.71% April, 2001 7.53% March, 2001 3.68% Cash Yield19.67% Investor Charge Offs 5.45% Base Rate 6.50% Over 30 Day Delinquency 4.84% Seller's Interest 8.52% Total Payment Rate14.20% Total Principal Balance$58,203,705,030.43 Investor Participation Amount$1,250,000,000.00 Seller Participation Amount$4,958,014,468.94