Exhibit 99.31

MBNA MASTER CREDIT CARD TRUST II

SERIES 1999-B

KEY PERFORMANCE FACTORS
May 31, 2001



Expected B Maturity 3/16/09


Blended Coupon 5.9788%


Excess Protection Level
3 Month Average 7.68%
May, 2001 7.52%
April, 2001 7.45%
March, 2001 8.08%


Cash Yield19.67%


Investor Charge Offs 5.45%


Base Rate 6.69%


Over 30 Day Delinquency 4.84%


Seller's Interest 8.52%


Total Payment Rate14.20%


Total Principal Balance$58,203,705,030.43


Investor Participation Amount$750,000,000.00


Seller Participation Amount$4,958,014,468.94