Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-J KEY PERFORMANCE FACTORS March 31, 1999 Expected B Maturity 9/15/04 Blended Coupon 5.1102% Excess Protection Level 3 Month Average 6.21% March, 1999 6.75% February, 1999 6.09% January, 1999 5.79% Cash Yield 19.18% Investor Charge Offs 5.12% Base Rate 7.31% Over 35 Day Delinquency 4.94% Seller's Interest 6.34% Total Payment Rate 14.77% Total Principal Balance $40,628,355,078.94 Investor Participation Amount $750,000,000.00 Seller Participation Amount $2,576,435,560.45