Exhibit 99.39 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-J KEY PERFORMANCE FACTORS March 31, 2001 Expected B Maturity 09/15/2009 Blended Coupon 7.0937% Excess Protection Level 3 Month Average 7.20% March, 2001 7.79% February, 2001 7.11% January, 2001 6.68% Cash Yield20.67% Investor Charge Offs 4.83% Base Rate 8.04% Over 30 Day Delinquency 4.90% Seller's Interest 7.37% Total Payment Rate14.60% Total Principal Balance$56,622,749,044.91 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$4,172,058,483.42