Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-J KEY PERFORMANCE FACTORS December 31, 1998 Expected B Maturity 9/15/04 Blended Coupon 5.7075% Excess Protection Level 3 Month Average 5.86% December, 1998 5.84% November, 1998 5.71% October, 1998 6.03% Cash Yield 18.72% Investor Charge Offs 4.98% Base Rate 7.90% Over 35 Day Delinquency 4.96% Seller's Interest 10.83% Total Payment Rate 13.62% Total Principal Balance $41,270,703,888.09 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,468,784,369.60