Previously posted DL SkyMiles appear to have disappeared from on line activity on Delta.com. I first noticed this after DL transactions were merged with NW WorldPerks transactions, but these are DL transactions (not NW) that had already been posted to DL this year. So far, I've noticed both air activity and non air activity missing: air activity (on DL) for an international round trip and 3,999 bonus miles from Nutrisystem have both disappeared.