I'm so sorry to learn of your loss. I'm especially sorry to hear that you may not be able to fly to the funeral.

Please ask them for more details about this if you are able to.

I would definitely follow their advice about it. And find out how long that you need to be "grounded".

I was given permission from the ER Dr. right after the MVA I was in that caused the concussion to go on vacation which included visiting a high altitude and I've always wondered if that was what contributed to my subsequent worsening condition which included an increase of intracranial pressure.

I missed two friends' funerals over the last few years because I was unable to attend/travel a much shorter distance. Sometimes, it has been very hard for me to accept what I can not do since the concussion... if I lost a sister I might feel devastated.

Perhaps you could take a train or a bus?