Exhibit 99.39 MBNA MASTER CREDIT CARD TRUST II SERIES 1998-J KEY PERFORMANCE FACTORS April 30, 1999 Expected B Maturity 9/15/2003 Blended Coupon 5.3297% Excess Protection Level 3 Month Average 5.78% April, 1999 5.27% March, 1999 6.69% February, 1999 5.39% Cash Yield17.83% Investor Charge Offs 5.23% Base Rate 7.33% Over 35 Day Delinquency 4.87% Seller's Interest10.40% Total Payment Rate14.17% Total Principal Balance$42,469,994,217.25 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,418,074,698.76