Niagara Falls?

That'll work fine.

And can she change it later if it looks like Niagara Falls might be in danger?

Yep.

Awesome. "I'm gonna anchor my soul to Niagara Falls for a contingent resurrection," she informs Lianelle, in case there is something obviously dumb about this plan.

"I don't know where that is but it sounds like a good idea to have contingent ressurections."

"It's just across the lake from Toronto, and it's a big famous geographical feature that seems unlikely to take major damage and if it does I'll find out about it hopefully in plenty of time. I'm gonna save this for when we get home so we don't need to scandalize the flight attendants though."

"There isn't anywhere to have sex on a plane?"

"Nope. One hears about people trying it but there is not a designated place and it is not encouraged."

"That didn't really stop me from having sex during my lifetime but I've learned that not everyone is like me."

"Speaking of, at some point do you want, like, your memories back."

"Oh hm, I'm not actually sure if I'm missing anything but I suppose I wouldn't mind it back? Though if you are getting things back for me I might want you to resurrect Lucian at some point. It's not urgent or anything, I just think he'd enjoy the future."

"I can start a list." She does this. Lucian can be on it and a few prominent dead espers.

"It is very attractive of you to have a list of people you're planning on resurrecting."

"Is it now."

"Yep. It's cause it's downstream of how you're the best person."

It is legal to kiss on airplanes.

The future has such a wise and libertine legal system.

Anyway it's a long flight and May wants to get some sleep after they get their first class inflight meals (salmon, broccoli, rice pilaf, and a miniature cheesecake).

Cheesecake! 

Also before May falls asleep does she know how someone can... move around here? Lianelle is bad at staying seated.

"Uh, airplanes suck at that, you can walk up and down the aisles a little bit if that light is turned off and you're not in anybody's way though."

"Okay - can I do gymnastics if I don't get in anyone's way and don't break anything?"

"...you can maybe get away with anything you can do within the space of our seats without jostling the chairs in front of us, I don't know what that leaves, and you have to stop if the flight attendants ask you to."

"Hm, if I do gymnastics in the bathroom such that no one notices is that okay?"

"Even more cramped than the seats, but I guess?"