Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS March 31, 1999 Expected B Maturity 6/17/02 Blended Coupon 6.4123% Excess Protection Level 3 Month Average 6.28% March, 1999 6.82% February, 1999 6.15% January, 1999 5.86% Cash Yield 19.18% Investor Charge Offs 5.12% Base Rate 7.24% Over 35 Day Delinquency 4.94% Seller's Interest 6.34% Total Payment Rate 14.77% Total Principal Balance $40,628,355,078.94 Investor Participation Amount $706,000,000.00 Seller Participation Amount $2,576,435,560.45