Exhibit 99.38 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-J KEY PERFORMANCE FACTORS April 30, 2001 Expected B Maturity 09/15/2009 Blended Coupon 7.0937% Excess Protection Level 3 Month Average 7.36% April, 2001 7.18% March, 2001 7.79% February, 2001 7.11% Cash Yield19.61% Investor Charge Offs 4.98% Base Rate 7.46% Over 30 Day Delinquency 4.89% Seller's Interest 9.33% Total Payment Rate13.70% Total Principal Balance$58,171,313,434.78 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$5,425,622,873.29