Exhibit 99.42 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-H KEY PERFORMANCE FACTORS March 31, 2000 Expected B Maturity 4/15/2004 Blended Coupon 6.3603% Excess Protection Level 3 Month Average 5.58% March, 2000 5.81% February, 2000 5.90% January, 2000 5.04% Cash Yield19.45% Investor Charge Offs 4.70% Base Rate 8.94% Over 30 Day Delinquency 4.65% Seller's Interest 8.73% Total Payment Rate15.20% Total Principal Balance$49,480,326,758.32 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$4,321,526,239.83