Yup - you'll be able to buy upgrades for 5000 miles (since you are on the full Y) or can do so on a space-available basis for $50 each at the airport.

Honestly though, I'd hesitate to do it unless you have 10k orphan Delta miles - it's a 30-35 minute flight, so you might get a couple of hard drinks (keep in mind beer/wine is free in coach on the Shuttle).