I'm doubting we'll see an answer from Tech or Admin on the weekend, but I can assure you FlyerTalk is not selling your discrete e-mail address; I'd have similar problems t(imes ten, probably) and FT / IB has been pretty assiduously about privacy issues.
Nothing from Nolo in my FT related e-mail in basket I can find.
OTOH, there's a
Nolo Business Breakdown | Take 40% Off e-mail spam in my spam basket from this afternoon from an address I use not remotely connected to FT, but a major provider it was probably e-mailed to.
We'll wait for a more official word next week - but I doubt it's connected to FT or IB. In the meantime,
here's the FT Privacy Policy.