Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS April 30, 1999 Expected B Maturity 6/17/02 Blended Coupon 6.4105% Excess Protection Level 3 Month Average 6.08% April, 1999 5.26% March, 1999 6.82% February, 1999 6.15% Cash Yield 17.83% Investor Charge Offs 5.23% Base Rate 7.34% Over 35 Day Delinquency 4.87% Seller's Interest 10.40% Total Payment Rate 14.17% Total Principal Balance $42,469,994,217.25 Investor Participation Amount $706,000,000.00 Seller Participation Amount $4,418,074,698.76