Exhibit 99.19 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-L KEY PERFORMANCE FACTORS SEPTEMBER, 1999 Expected B Maturity 12/15/99 Blended Coupon 5.5271% Excess Protection Level 3 Month Average 6.05% September, 1999 5.90% August, 1999 5.88% July, 1999 6.37% Cash Yield 18.03% Investor Charge Offs 4.60% Base Rate 7.53% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate 14.16% Total Principal Balance $ 45,780,732,257.76 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 3,198,912,739.27