Here is a summary of the relatoinships of owlet-nightjars. The owlet-nightjars are now thought most likely to be closest to Apodiformes, so the group of birds that includes owlet-nightjars and the Apodiformes is named Deadalornithes.
"A name for the clade formed by owlet-nightjars, swifts and hummingbirds
(Aves)"
"Recent phylogenetic studies of non-passerine birds provide congruent support for a clade formed by owlet-nightjars (Aegothelidae) and swifts and hummingbirds (Apodiformes). This clade is here named Daedalornithes (new clade name) based on the principles of phylogenetic taxonomy."
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