Exhibit 99.37 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-A KEY PERFORMANCE FACTORS December 31, 1999 Expected B Maturity 2/17/04 Blended Coupon 6.6233% Excess Protection Level 3 Month Average 5.52% December, 1999 4.66% November, 1999 5.80% October, 1999 6.11% Cash Yield19.14% Investor Charge Offs 5.04% Base Rate 9.44% Over 30 Day Delinquency 4.63% Seller's Interest11.35% Total Payment Rate14.35% Total Principal Balance$49,947,826,881.37 Investor Participation Amount$500,000,000.00 Seller Participation Amount$5,671,007,362.88