Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-B KEY PERFORMANCE FACTORS October 31, 1997 Expected B Maturity 3/15/12 Blended Coupon 5.8585% Excess Protection Level 3 Month Average 4.87% October, 1997 5.32% September, 1997 4.77% August, 1997 4.54% Cash Yield 18.37% Investor Charge Offs 4.61% Base Rate 8.44% Over 35 Day Delinquency 4.76% Seller's Interest 13.78% Total Payment Rate 14.00% Total Principal Balance $31,941,631,051.83 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $4,401,496,533.34