Exhibit 99.42 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS October 31, 2000 Expected B Maturity 10/16/06 Blended Coupon 6.9533% Excess Protection Level 3 Month Average 5.71% October, 2000 6.16% September, 2000 5.57% August, 2000 5.42% Cash Yield19.62% Investor Charge Offs 4.51% Base Rate 8.95% Over 30 Day Delinquency 5.23% Seller's Interest10.66% Total Payment Rate14.07% Total Principal Balance$56,359,968,018.99 Investor Participation Amount$750,000,000.00 Seller Participation Amount$6,009,277,457.50