BA luggage allowance - USA flights

[Katamarino]

I had long understood that US regulations meant that all carriers operating into and out of the USA were obliged to allow people 2 checked bags of up to 23kg, even in economy. However, looking at booking flights now, and BA are telling me that my allowance will only be 1 bag (changed from 2 as of the end of 2009) - has the USA changed their policy, or are BA trying it on?

Edit: I notice Virgin has changed this too. What a crock of ....