Exhibit 99.12 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-A KEY PERFORMANCE FACTORS August 31, 1999 Expected B Maturity 3/17/03 Blended Coupon 5.5067% Excess Protection Level 3 Month Average 5.67% August, 1999 5.92% July, 1999 5.95% June, 1999 5.14% Cash Yield 18.20% Investor Charge Offs 4.78% Base Rate 7.51% Over 30 Day Delinquency 4.81% Seller's Interest 7.19% Total Payment Rate 14.37% Total Principal Balance $46,158,397,644.87 Investor Participation Amount $700,000,000.00 Seller Participation Amount $3,316,578,126.38