Exhibit 99.37 MBNA MASTER CREDIT CARD TRUST II SERIES 1998-J KEY PERFORMANCE FACTORS September 30, 1999 Expected B Maturity 9/15/03 Blended Coupon 5.3568% Excess Protection Level 3 Month Average 6.16% September, 1999 6.04% August, 1999 6.05% July, 1999 6.39% Cash Yield18.00% Investor Charge Offs 4.60% Base Rate 7.36% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate14.16% Total Principal Balance$45,780,732,257.76 Investor Participation Amount$750,000,000.00 Seller Participation Amount$3,198,912,739.27