American Express USCS Card Member Loans 30 Days Past Due Loans As A % Of Total 1.3% At May End; USCS Card Member Loans Net Write-Off Rate-Principal Only 2.1% At May End; U.S. Small Business Card Member Loans 30 Days Past Due Loans As A% Of Total 1.5% At May End; U.S. Small Business Card Member Loans Net Write-Off Rate - Principal Only 2.4% At May End; Says Effective June 1, Reclassified About $1.6B In Card Member Loans Related To Amazon Small Business Cobrand Portfolio