Is it a bird, is it a plane? No it's a whale!

[Leading Observer]

https://www.msn.com/en-gb/video/viral/airbus-beluga-xl-does-wing-wave-over-chester/vi-BBTBjYq?ocid=spartandhp

[PR19_Kit]

I saw that y'day, heading up  the other side of the Severn from a fly-over at Filton. 

It's not easy to tell from a regular Beluga, except that the fin on the XL looks smaller. I expect it's actually because all the rest of it is larger though. The distinguishing winglets are invisible at any distance.