Exhibit 99.42 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-H KEY PERFORMANCE FACTORS May 31, 2000 Expected B Maturity 4/15/2004 Blended Coupon 6.5834% Excess Protection Level 3 Month Average 5.63% May, 2000 5.88% April, 2000 5.20% March, 2000 5.81% Cash Yield19.32% Investor Charge Offs 4.66% Base Rate 8.78% Over 30 Day Delinquency 4.70% Seller's Interest 9.50% Total Payment Rate14.38% Total Principal Balance$52,496,626,963.52 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$4,987,826,445.03