If you are going to a medical appointment in another state, these are some resources that may be helpful regarding air travel. Some offer significant discounts or free travel.
ANGEL FLIGHT
978-794-6868
www.angelflightne.org
OPERATION LIFT OFF
Need 7 to 10 days notice
(888) 354-5757
https://www.operationliftoff.org/
MIRACLE FLIGHT FOR KIDS
Need 15 days notice
(800) 359-1711
www.miracleflights.org/
NATIONAL PATIENT TRAVEL
(800) 296-1217
http://www.patienttravel.org/
AMR AIR AMBULANCE
(800) 424-7060
NATIONAL TICKET HELP
(800) 325-8908
Also, for lodging, Ronald McDonald House has houses in many cities that can be used for children up to ages 18-21.