Flying with bike (in a bike box)

[Binky]

Cabin pressure is the equivalent of 5-8000 feet, so unless you'd deflate your tyres for going up the Stelvio or the Tourmalet (I'd take a few psi off myself) then don't bother.
Of course, if challenged by ground staff, lie till your pants are ablaze rather than try to explain any laws of physics.

I can fit my track pump in case so I'll take that so no reason not to deflate tyres just as a precaution anyway.

Overall my only concern so far is the Di2 battery which is not easily removeable so that is something I definitely won't be mentioning!
Nightmare scenario is if they x-ray case(assume all bags are as a matter of course) and it picks up battery as an anomaly or something. I'm stuffed then as can't remove.

 

[Dorset Boy]

Really no need to deflate your tyres. I've travelled with them at 80 psi plenty of times.
CO2 cylinders - contact the airline to confirm you are taking them - if you can get them to email confirmation, print that off and wrap around the cartridges.
Buy a chain Johnny (or equivalent) to cover the drive train.
I have a PBK box which is basically a Bonza one, and my through skewer bent badly, making it hard to remove a wheel. I have now purchased a Skew Fix - disc wheel support system from https://www.bikebox-online.co.uk/ which will sort out the issue, really great service from them.
I also wrap a plastic bag around my seatpost so carbon paste (or the white stuff now used by Canyon) doesn't go everywhere.
The zip tie suggestions are essential advice - the clips do come open far too easily - just make sure you will have access to something to cut them open when you arrive!

 

[Dogtrousers]

I can fit my track pump in case so I'll take that so no reason not to deflate tyres just as a precaution anyway.

Overall my only concern so far is the Di2 battery which is not easily removeable so that is something I definitely won't be mentioning!
Nightmare scenario is if they x-ray case(assume all bags are as a matter of course) and it picks up battery as an anomaly or something. I'm stuffed then as can't remove.

They really shouldn't object. It's way under 100 Watt hrs and it's installed in equipment. The regs say that's OK. But to keep you on tenterhooks the airline could object. Just for a laugh.

 

[Binky]

Another question which has occurred as wife just messaged me to say she's about to book a TUI package to Mallorca so it looks like TUI not Jet2 next week is what happens at other end with coach transfers to hotel? Anyone had any issues with those?