They do exist - Google around. Travelling Baby Company is one we used. We have family in Massachusetts and have done this. We have also had the stuff delivered right to our Air B and B. Are you going to the Cape? If so, they have places that drop the stuff right at your rental house. If you are going to the Berkshires, they don't, and airport pickup might be your only option.

confused. Where is end destination?

The car seats you can rent from the rental car place if you're renting a vehicle, or request fro airport transfer service. Stroller and PnP, why would you have those delivered to airport instead of hotel or other location where you're staying?

does this exist? I'd need 3 carseats, a strolller, and a PnP delivered to Logan in August. Recommendations?
Thanks.