Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS June 30, 1999 Expected B Maturity 6/17/02 Blended Coupon 6.4180% Excess Protection Level 3 Month Average 6.08% June, 1999 5.28% May, 1999 7.70% April, 1999 5.26% Cash Yield 17.44% Investor Charge Offs 5.06% Base Rate 7.09% Over 30 Day Delinquency 4.82% Seller's Interest 11.01% Total Payment Rate 13.71% Total Principal Balance $44,380,968,357.42 Investor Participation Amount $706,000,000.00 Seller Participation Amount $4,888,448,838.93