Exhibit 99.37 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-J KEY PERFORMANCE FACTORS June 30, 2001 Expected B Maturity 09/15/2009 Blended Coupon 7.0937% Excess Protection Level 3 Month Average 6.96% June, 2001 6.47% May, 2001 7.24% April, 2001 7.18% Cash Yield18.98% Investor Charge Offs 5.67% Base Rate 6.84% Over 30 Day Delinquency 4.78% Seller's Interest 8.00% Total Payment Rate14.15% Total Principal Balance$57,876,901,808.74 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$4,631,211,247.25