Depends on when you want to say summer starts, but...

May:
LAX-ORD-DUB (inaugural flight on 1 May!)
LHR-JFK
JFK-LAX
LAX-BOS
LAX-SJC

June:
Going to YYZ, ORD, GRR, and HAJ (don't know how I'm going to swing a OW routing on the HAJ trip, but I'll try. Suggestions welcome!)

July-August: not sure yet - definitely SAN, maybe LAP, probably a couple of trips to NYC and BOS. And I'll probably treat myself to a little weekend getaway in Hawaii for my birthday in August.