Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS June 30, 1998 Expected B Maturity 6/17/02 Blended Coupon 6.5202% Excess Protection Level 3 Month Average 5.24% June, 1998 4.77% May, 1998 5.01% April, 1998 5.94% Cash Yield 17.67% Investor Charge Offs 5.10% Base Rate 7.79% Over 35 Day Delinquency 5.06% Seller's Interest 12.61% Total Payment Rate 13.35% Total Principal Balance $35,974,950,178.51 Investor Participation Amount $706,000,000.00 Seller Participation Amount $4,536,555,660.02