Exhibit 99.42 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-H KEY PERFORMANCE FACTORS December 31, 1999 Expected B Maturity 4/15/2004 Blended Coupon 6.4874% Excess Protection Level 3 Month Average 5.04% December, 1999 4.89% November, 1999 4.98% October, 1999 5.24% Cash Yield19.21% Investor Charge Offs 5.04% Base Rate 9.28% Over 30 Day Delinquency 4.63% Seller's Interest11.35% Total Payment Rate14.35% Total Principal Balance$49,947,826,881.37 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$5,671,007,362.88