[He's absolutely beaming already, but when Byleth seems to be enjoying himself more... that just makes his grin widen. Turning a bit lopsided.]

And you're doing a great job for a first time flight.

[No really, he means it.]

I've never pushed it to the limit before. But - hundreds of light years, I'd say, if necessary. [He pauses.] So - faster than any pokemon or vehicle here.