Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS May 31, 1999 Expected B Maturity 6/17/02 Blended Coupon 6.4066% Excess Protection Level 3 Month Average 6.59% May, 1999 7.70% April, 1999 5.26% March, 1999 6.82% Cash Yield 19.45% Investor Charge Offs 4.88% Base Rate 6.87% Over 30 Day Delinquency 4.89% Seller's Interest 6.97% Total Payment Rate 14.69% Total Principal Balance $41,914,776,221.36 Investor Participation Amount $706,000,000.00 Seller Participation Amount $2,922,256,702.87