This question already has an answer here:
I came to the US from the UK on September 1st and spent the full 90 days travelling round under the VWP and an ESTA. After my 90 days were up I have come to Mexico, where I will be spending 6 weeks in the country.
As of yet I do not have a flight booked back to the UK but have stared to look before I return home, I would love to stop in Salt Lake City for a week to see my brother.
Does anyone know if this is possible, having spent 6 weeks out of America would I be able to return for a week on a new VWP with a flight booked back to the UK?
Having read a few things online which suggests I can and others that say I can't.