Exhibit 99.46 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-M KEY PERFORMANCE FACTORS February 29, 2000 Expected B Maturity 11/15/2004 Blended Coupon 6.6788% Excess Protection Level 3 Month Average 4.44% February, 2000 6.05% January, 2000 5.26% December, 1999 2.02% Cash Yield18.80% Investor Charge Offs 4.75% Base Rate 8.00% Over 30 Day Delinquency 5.01% Seller's Interest 9.54% Total Payment Rate14.30% Total Principal Balance$48,263,301,515.80 Investor Participation Amount$500,000,000.00 Seller Participation Amount$4,604,500,997.31