Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS December 31, 1997 Expected B Maturity 3/15/04 Blended Coupon 6.1429% Excess Protection Level 3 Month Average 5.20% December, 1997 5.23% November, 1997 4.95% October, 1997 5.43% Cash Yield 18.25% Investor Charge Offs 4.64% Base Rate 8.38% Over 35 Day Delinquency 4.81% Seller's Interest 16.15% Total Payment Rate 13.29% Total Principal Balance $34,934,847,924.76 Investor Participation Amount $750,000,000.00 Seller Participation Amount $5,643,513,406.27