Upvote:3
It's asking about the first entry.
The next time you enter the US (on the 17th) is a separate trip.
Once you've 'activated' on arriving, it then covers you for the next 90 days, including arriving by land. However, if asked about it, do mention it to the officer when you arrive.
I have links, but I think the answers in If I have an ESTA approved for transit, can I visit a second time as a tourist?, while not quite the same question, will address what you're wondering as well.
While the US doesn't have the same concept of 'transit' as other countries (you'll still go through immigration) - since it's a transit between flights, you'll still answer yes to this.