Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS February 29, 2000 Expected B Maturity 3/15/04 Blended Coupon 6.0463% Excess Protection Level 3 Month Average 5.43% February, 2000 6.21% January, 2000 5.42% December, 1999 4.65% Cash Yield 18.80% Investor Charge Offs 4.75% Base Rate 7.84% Over 30 Day Delinquency 5.01% Seller's Interest 9.54% Total Payment Rate 14.30% Total Principal Balance $48,263,301,515.80 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,604,500,997.31