Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-J KEY PERFORMANCE FACTORS December 31, 1997 Expected B Maturity 9/15/04 Blended Coupon 6.1533% Excess Protection Level 3 Month Average 4.73% December, 1997 5.22% November, 1997 4.94% October, 1997 4.05% Cash Yield 18.25% Investor Charge Offs 4.64% Base Rate 8.39% Over 35 Day Delinquency 4.81% Seller's Interest 16.15% Total Payment Rate 13.29% Total Principal Balance $34,934,847,924.76 Investor Participation Amount $750,000,000.00 Seller Participation Amount $5,643,513,406.27