Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-L KEY PERFORMANCE FACTORS NOVEMBER, 1997 Expected B Maturity 12/15/99 Blended Coupon 5.9416% Excess Protection Level 3 Month Average 5.05% November, 1997 4.86% October, 1997 5.44% September, 1997 4.83% Cash Yield 17.42% Investor Charge Offs 5.01% Base Rate 7.55% Over 35 Day Delinquency 4.98% Seller's Interest 11.93% Total Payment Rate 12.41% Total Principal Balance $ 31,670,462,473.51 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 3,779,127,955.02