I guess this might not be "in flight" as his two feet are down. So if the moderators want to remove it go ahead. But I think it is close enough as if his wings weren't going he could not stay like that.
Hummingbird moth.
DSC_9969-1 by William Friggle, on Flickr
Hummingbird moth.
DSC_9969-1 by William Friggle, on Flickr