So... according to the book "Alien Interview", Airl visited Earth to look after the planet because humans began to conduct nuclear tests.

The first nuclear test, code name "Trinity", was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico. That desert is about 120 miles (190 km) west of Roswell.

But the test was conducted in 1945, and the Roswell crash occured in 1947. Why did they wait 2 years?

At the end of the book, Matilda describes how she realized years later that she was one of the lost battalion. That's why she was able to communicate with Airl, and that's why Airl was not willing to communicate with anybody else.

Let's assume this is true...

So, the ship "crashed" near Roswell, where Matilda is stationed. What a coincidence!

Airl is a "network engineer". Farsight described her as a diplomat.

What network was Airl assigned to initiate in 1947?

When Yeme talked to Airl and asked her wether she knows her, Airl answered: "Everybody knows you, Farsight girl."

But that was Airl in 1947, wasn't it? How did she know Yeme back then? How did she know that everybody knows Yeme?

What network is Airl working on now?

Let's talk about Quantum unified field and the perception through different realities timelines, local and non-local time space which i believe it is the case.

"Particularly - why it takes her 2 years to crash after investigating."

➡️ https://en.wikipedia.org/wiki/Trinity_UFO_Case

Follow the "hoaxes"...

"So, the ship "crashed" near Roswell, where Matilda is stationed. What a coincidence"
i don't believe this as a coincidence, it just happened to be her, could be another person, in this case was Matilda!

"Airl is a "network engineer". Farsight described her as a diplomat"
Network as in, data communication tech or network as in multiple people centered, social engineering or peoples relationship which in that case the "diplomat" can be applied?!

"What network was Airl assigned to initiate in 1947?"
that's a good question.

"But that was Airl in 1947, wasn't it? How did she know Yeme back then? How did she know that everybody knows Yeme?"
i believe we cannot see it through our human lenses, we still don't understand what telepathy is, much more their plane of existence, we have seen through several projects how their minds operate which led to several discussion here about quantum field, parallel realities, time as an illusion, ad the access our higher mind has in multiple timelines realities.
We've always assumed that in their plane of existence telepathy is their form of communication and if that was the case then it means that everybody knows about everybody to some degree, specially when they "connect or focus" their energy, which is something that was talked about in the last Farsight meeting, i believe.
If everything is non local it means there is no separation, no perception of distance through time and space, everything is here and now.
To perceive a past event regardless if it happened yesterday or 80 years ago there's no difference, but obviously, as i understand it, that is where our higher minds/self are and have access to it.
So "Why does she say the same thing to Yeme? Isn't it plausible that Yeme is just used to that phrase and can think of it as a deduction?" this is something i don't believe due to the above! if it were true, then that would basically kill almost over ten years of data collecting and almost none of these projects have any validity to them!, which again, i definitely don't believe!

Also could it be possible that their tech allows them to travel through time and space, meaning 2 years for them can be 10 years or maybe 5 minutes?!

"This raises the next question: Why did Airl have to connect to her base in the asteroid belt to get information about humanity? Why didn't she just remote view it, if it's that easy?"
- could the level of data through remote viewing on their part be so detailed? for example we know they have technology that enables them to enhance telepathy/communication and also bypass psychic/energy blocks.
This also remindes of hypnose session from Alba Weinman where the hypnotized person was seeing her past self as an ET, they were traveling through space in their ship, a whole team, each one with it's own job to do, she saw her self in a different plane visiting a planet that was born not that long ago and they were taking care of the ecosystem in order to prepare it for life, like taking care of universe ecosystem, just like scientist, she was taking samples and working with technology that we can even imagine, meaning with all of this is that, they couldn't just remote viewed the planet and it's bacterial blueprint, they needed to be there psychically.

"As far as I'm concerned, time travel into the past is either impossible, because the past happened and cannot be altered, or it doesn't have the consequences one would expect. If it was that easy, everybody would do it, but if everybody would do it, nobody can change anything."
- apparently not quite according to theory (of course), the name for this would be quantum entanglement, and each reality is it's own reality, timelin. How many times did we heard the Mandela effect / collective parallel reality, i wonder how many times CERN did something about this, changing the collective timeline of the whole earth to a parallel version extremely similar but fewer nuances!
Also remindes me about OBE's travelling into past timelines and past lifes, and experiencing "psysically" those realities, how much the physical is an illusion from our perception of consciousness, and just a fragment of it?!
So if that can be considered an example, meaning, travelling consciously by accessing that plane of existence, is there a difference then for those ET beings that operate in that frequency?!