Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-J KEY PERFORMANCE FACTORS March 31, 1998 Expected B Maturity 9/15/04 Blended Coupon 5.8589% Excess Protection Level 3 Month Average 5.11% March, 1998 5.80% February, 1998 4.68% January, 1998 4.85% Cash Yield 18.54% Investor Charge Offs 4.85% Base Rate 7.89% Over 35 Day Delinquency 5.06% Seller's Interest 11.41% Total Payment Rate 13.80% Total Principal Balance $33,909,306,783.29 Investor Participation Amount $750,000,000.00 Seller Participation Amount $3,867,972,264.80