@tonyde
Good question for your neurologist.
Some say you have an increased risk if you have a history of frequent seizures. And seizures are more frequent for days after a seizure. But who knows, these seizures may have happened anyway.
I live in Central California and have flown to Seattle a couple of times, Denver and Los Angeles and San Francisco quite a few times but not as far as your trip.
When I flew to Los Angeles 300 miles away I was having seizures every day. I didn't have a seizure on the plane but I did have one later that night, but that was expected. I was thinking about going to Australia once however, I decided against it because it's such a long flight. I believe around 17 hours.
Here is some information,
https://www.seizure-journal.com/article/S1059-1311(06)00061-6/pdf#:~:text=The%20position%20taken%20by%20the,seizure%20increase%20after%20air%20travel.
Take care,
Jake