Exhibit 99.43 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-J KEY PERFORMANCE FACTORS June 30, 2000 Expected B Maturity 09/15/2009 Blended Coupon 7.0937% Excess Protection Level 3 Month Average 5.18% June, 2000 4.80% May, 2000 5.55% April, 2000 5.19% Cash Yield18.75% Investor Charge Offs 4.56% Base Rate 9.39% Over 30 Day Delinquency 4.60% Seller's Interest12.05% Total Payment Rate14.03% Total Principal Balance$54,839,173,315.51 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$6,607,972,797.02