Exhibit 99.37 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-A KEY PERFORMANCE FACTORS May 31, 2000 Expected B Maturity 2/17/04 Blended Coupon 6.6788% Excess Protection Level 3 Month Average 5.71% May, 2000 5.75% April, 2000 5.45% March, 2000 5.93% Cash Yield19.29% Investor Charge Offs 4.66% Base Rate 8.88% Over 30 Day Delinquency 4.70% Seller's Interest 9.50% Total Payment Rate14.38% Total Principal Balance$52,496,626,963.52 Investor Participation Amount$500,000,000.00 Seller Participation Amount$4,987,826,445.03