We're booked onto a flight to Portugal to visit my parents, who live there and whom we haven't seen in 2 years now. It took a lot of dithering and agonising to get this far and the pre-flight Stuff is fairly stressy - but I've booked three of us LFTs (Portugal will accept lateral flows as well as PCRs), I'm onto the Day 2 tests, I know where to get the return-to-UK tests from when there - but then, having booked all this and flights, I realised belatedly that DS2 (10) who is under the age for being tested to enter the country, is either going to have to wear a mask in the plane and airport of the destination, or have some sort of official exemption. I don't think a sunflower lanyard will cut it. 
We've got used, I suppose, to being in the UK where there's a relatively old cut-off for kids not having to wear masks. In most EU countries, I think the age at which you need to use a mask starts much earlier. For Portugal, it's 6 and the same goes for TAP, the national airline we're flying. I just rang TAP and after checking with someone, the woman I spoke to said either we have to fill out their very generic, medical form and get a doctor to fill part of it out (ASD isn't a medical condition, this form is clearly pre-Covid and is very much about short-term and physical conditions, but I suppose there's a space where a sympathetic doctor would be able to record that his ASD made it impossible for him to wear a mask) OR get a doctor to write a statement saying he is autistic and his disability means he can't wear a mask. I will get onto it tomorrow but I know GPs are increasingly likely to refuse letters and statements like this. I mean, I know they might charge and that's fine. I'm just worried they'll refuse to write one at all.
(Please don't bother telling me that yes he CAN wear a mask! Believe me, we've tried everything the last 18 months. I will continue trying and will try on the flight but he will not tolerate it for more than a second, unless a miracle is wrought.)
Just wondered if anyone else had had the temerity to travel with a child with LD who will not tolerate a mask, and, well, how you've got on. 