Exhibit 99.39 MBNA MASTER CREDIT CARD TRUST II SERIES 1998-J KEY PERFORMANCE FACTORS August 31, 1999 Expected B Maturity 9/15/03 Blended Coupon 5.3495% Excess Protection Level 3 Month Average 5.83% August, 1999 6.05% July, 1999 6.39% June, 1999 5.04% Cash Yield18.20% Investor Charge Offs 4.78% Base Rate 7.38% Over 30 Day Delinquency 4.81% Seller's Interest 7.19% Total Payment Rate14.37% Total Principal Balance$46,158,397,644.87 Investor Participation Amount$750,000,000.00 Seller Participation Amount$3,316,578,126.38