Hope some of this can be of help:
1- Jet Blues policy had you clicked on Covid-19 Info HUb; (the last sentence is important and works against you) The mask is not an ask.
Federal law requires masks to be worn by all travelers 2 years and older at all times throughout the flight including during boarding and deplaning, and in the airport. Any individual who fails to comply with this law may be subject to denied boarding, removal from the aircraft and/or penalties under federal law.
More on mask requirements.
Mask must be worn properly, to cover nose and mouth.
Masks with vents or exhalation valves are not permitted.
Plastic face shields may be worn in addition to a mask but not in place of one.
If conditions on board a flight necessitate, masks should be removed to accommodate the placement and wearing of oxygen masks.
Customers with conditions that prevent them from wearing a mask should consider postponing travel.
Also no where does it say a Face Shield is OK w/o a mask most carriers say its NOT could be in your childs case it will be.
That said AA is the opposite: Face coverings Expand
U.S. federal law requires that you wear a face covering at all times while indoors at the airport and on board your flight If you refuse to wear one, you may be denied boarding and future travel on American. You may also face penalties under federal law.
These rules do not apply to children under 2, or if you have a disability that prevents you from wearing a face covering and meet the exemption requirements.
Visit the Centers for Disease Control and Prevention (CDC) website for more information about the mask requirement.
Requirement for face masks on planes and in airports Opens another site in a new window that may not meet accessibility guidelines.
You should bring your own face covering to use while traveling. While limited quantities of face coverings may be available at the gate, they will not be available for every customer on every flight.
Acceptable face coverings
A mask or 2 layered secured cloth that completely covers your nose and mouth and fits snugly to the sides of your face and under your chin
Face shields worn with a face covering, but not in place of one
But the above assumes that the CDC or some Fed Dept includes a person with Autism I personally dont know if thats considered a good enough reason
Lastly the CDC: Disability Exemptions of the Order
Who is covered by the exemption for “a person with a disability who cannot wear a mask, or cannot safely wear a mask, because of the disability as defined by the Americans with Disabilities Actexternal icon (ADA, 42 U.S.C. 12101 et seq.)”?
Most people, including those with disabilities, can tolerate and safely wear a mask and are required to wear one as per CDC’s Order. However, certain people with disabilities who, because of their disability, cannot wear a mask, or cannot safely wear a mask, are exempted from CDC’s mask-wearing requirement.
The exemption is not meant to cover people with disabilities for whom wearing a mask might only be difficult or whose disability does not prevent them from wearing a mask or wearing a mask safely.
The following narrow subset of persons with disabilities are exempt from CDC’s requirement to wear a mask:
A person with a disability who, for reasons related to the disability, would be physically unable to remove a mask without assistance if breathing becomes obstructed. Examples might include a person with impaired motor skills, quadriplegia, or limb restrictions
A person with an intellectual, developmental, cognitive, or psychiatric disability that affects the person’s ability to understand the need to remove a mask if breathing becomes obstructed
The following persons with disabilities might be exempt from CDC’s requirement to wear a mask based on factors specific to the person:
A person with a disability who cannot wear a mask because it would cause the person to be unable to breathe or have respiratory distress if a mask were worn over the mouth and nose. A person with a condition that causes intermittent respiratory distress, such as asthma, likely does not qualify for this exemption because people with asthma, or other similar conditions, can generally wear a mask safely.
A person with a disability requiring the use of an assistive device, such as for mobility or communication, that prevents the person from wearing a mask and wearing or using the assistive device at the same time. If use of the device is intermittent and the person can remove the mask independently to use the device, then a mask must be worn during periods when the person is not using the device.
A person with a severe sensory disability or a severe mental health disability who would pose an imminent threat of harm to themselves or others if required to wear a mask. Persons who experience discomfort or anxiety while wearing a mask without imminent threat of harm would not qualify for this exemption.
Now could be JB cant disallow what the CDC allows, if you find you child qualifys for the exemption, I still wouldnt fly with JB simply since the flight crew might not be up on it nor for your return. I would book with a Carrier like AA that has it plain and simple that they acknowledge that there are exceptions or any other Carrier that has this as their guidelines. Seems you are going for Yom Tif and the last thing you need is for a Capt to off load you and now you wont make it
I would quote JB The CDC rules if they in fact apply to you and thusly tell them they are not upholding US Law and to avoid a nasty PR issue and suing for the refund, they should simply tell PL to issue you a full refund.
Then do yourself 1 other favor dont book via any 3rd party site, book direct with the carrier, you dont need problems the day of travel and the carrier will tell you, you have to deal with the agency you purchased it from
If your child doesnt fall into the CDCs exemption area then forget about flying, if you arent sure call The CDC tomorrow or the Agency for Disabilities before calling Jet Blue or book another tkt
Wish I could help you out more , I hope the above helps you to get a Refund from JB and in finding which if any carrier you can fly with
Either way fill out a complaint with DOT if you child falls into the Exemptions so that they can let JB know they have to accept some one who is Exempted but only do so after knowing they are Exempt (not that it makes sense they should be) and calling JB and letting them know that and thusly a full refund is due you
If you are still head strong about still flying with JB, bear in mind that if their website doesnt acknowledge there are exemptions most likely the ground crew and plane crews wont either, and I highly doubt that even if they agree with you that they messed up that it will reach all their employees 1-2-3 and it time for your trip. But that choice is up to you