Flier Team

Well, whenever you make any kind of emblem team it's important to have several units you can use to switch out when needed. You've got a pretty good pool of characters, which is great. Definitely build your Elincia, NY Azura, Spring Camilla, Legendary Robin, Cordelia, Female Morgan, Hinoka (yes, even if she's -atk), Caeda, Cherche, and Shigure.

I would highly recommend super merging Cordelia, Caeda, Cherche, and Shigure. Even Beruka can be absolutely amazing when super merged! The only thing that your flier team is lacking is more tome fliers like Halloween Nowi or Summer Corrin, since Morgan (-spd) and Spring Camilla have more niche builds and aren't able to handle as many situations as well.

If you want to know which fliers to start building first, I would recommend Elincia, NY Azura, Spring Camilla, Cordelia, and Hinoka.

Well, who do you like most?

I'd personally pick...

Elincia - Obvious reasons, she's a part of the rare Red Flyer category, and her sword gives her a Brave effect.

Hibowka - Extremely fast Brave Bow user, or can be a pretty good mage tank.

Est - Probably my favorite blue flying unit (after F!Morgan). She can run a Brave Lance build and a Firesweep Lance build (so can other units, like Cordelia, but I just prefer Est).

Camilla - She was a good unit before, but her weapon refinement made her an even better unit, and she can support her flying brothers and sisters even more thanks to her Camilla's Axe effect, granting flying (or cavalry) units within 2 spaces of her +3 to attack and speed.

depends on how much you want to invest into them. are you planning on adding merges? If so, you want to stay away from seasonal because they are very expensive.

I'd go with Elincia, Cordelia, Camilla and Legendary robin. That way you got all colours, you got 2 cheaper units that you can easily merge up (Camilla/Cordelia) and then some magical damage with robin.