Didn’t she fly over first class for her brother’s wedding in Scotland when Alexander was a baby too? And then her husband ended up flying over (first class as well) on a different plane a few days later with Amelia. This was about 6 months before the family trip over where she discovered she was pregnant with Archie.
In fairness, I do get why she flew first class when it was just her and Archie as a newborn this year. It was a singular ticket going to visit her mum (as I think her mum had been meant to go to Australia for the birth but couldn’t due to health issues) and if I was doing a week long trip that far away, had plenty of money and travelling solo with a newborn I’d have probably opted for first class too
I do think it’s odd she suddenly stopped showing Alexander in any of her videos. This came after she talked about him having speech problems and going to see a therapist earlier this year - I suspect there might be some medical issues going on (autism?) and that’s why she’s removed him from her page for now until she’s ready to publicly discuss it.