Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[Q]: I'm flying United from Melb to Mexico City, with a transfer at LAX. MEL=>LAX UA99, LAX=>MEX UA1077.

These were booked on "one ticket" (I believe I'm using the term correctly?), I paid United once and have a single itinerary describing all the flights.

I am now learning that the transfer time for these flight is perhaps tighter than I should have booked (1h45m). I have never travelled internationally before and just picked the one with the shortest layover.

According to step 5 here[1] I don't have to pass through customs, though I'd hardly say its a reliable resource.

This map seems to show UA exclusively limited to terminal 7/8 and apparently there is an "airside" inter-terminal connection between 6,7 and 8.

So I'm figuring that if UA99 lands at 7/8 and UA1077 departs from 7/8, then I can get off one plane, walk to the gate and get on the next, without any customs or immigration? I'm also carry-on only, so no bags to drop/collect/etc.

Is it reasonable to think that?

Relatedly, if I was to miss my connection due to immigration, delays, etc, would United rebook me to the next available since I booked "one ticket"?


wikihow com Switch-Flights-in-LAX (sorry, can't post more than one link..., add a dot and a slash...)


[A]: LAX transit between flights without transfer between terminals


[Q]: Since I don't have any priority, I avoid using priority seats* on busses, trains etc. However I see that other people who have no priority are occasionally using those seats. I wonder if there is a general code or etiquette for it.

Should I continue to avoid using priority seats even if they are vacant?

* Some seats may be for disabled people.

[A]: Can I use a priority seat if it is vacant?


[Q]: I'm aware there's a form you can sign if ground staff at an airport doesn't want to let you to board an aircraft due to ignorance regarding the destination's entry (or in this case transit) requirements. This way, the carrier's liability is waived if you don't get into your destination.

What is the form called? In other words, what exactly should I ask for?

More likely than not, I'm going to have to ask for this at Tbilisi airport, from where I'm taking a flight to Doha in 3 days (in transit to London). As I only hold an ID card, which is accepted for the UK (my destination), I don't expect to get an easy time boarding the Tbilisi-Doha flight (even though I'll not be entering Qatar), because Timatic doesn't explicitly state that I can transit Qatar on my ID (nor does it state the opposite). Hence, such a form would be of great help.

I've read about this in this blog, where the author, who had trouble boarding a flight to Minsk for transit with her Portuguese ID card, writes:


  I wrote some haiku style poems on my phone until the airline man came with a sheet for me to sign: 'It's to make you responsible for coming back, in case they don't allow you to stay in Minsk or enter Georgia.'


[A]:
What form waives the airline's liability in case of an entry refusal?