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Description
This cladogram is speculative, but it is mostly in line with scientific studies mixed in with my own opinion; no actual phylogenetic analysis was undertaken. Feel free to comment or suggest changes, but be aware that I may reject or modify your suggestions.

Definitions for clade names:

Avialae - Vultur gryphus <- Dromaeosaurus albertensis, Saurornithoides mongoliensis
Jeholornithiformes - Jeholornis prima <- Passer domesticus
Euavialae - Passer domesticus <- Jeholornis prima, Rahonavis ostromi
Avebrevicauda - Passer domesticus + Sapeornis chaoyangensis
Omnivoropterygidae - Omnivoropteryx sinousaorum <- Passer domesticus
Elopterygidae - Balaur bondoc + Elopteryx nopcsai + Gargantuavis philoinos <- Alvarezsaurus calvoi, Hesperonychus elizabethae, Passer domesticus, Scansoriopteryx heilmanni
Pygostylia - Confuciusornis sanctus + Passer domesticus
Confuciusornithiformes - Confuciusornis sanctus <- Enantiornis leali, Passer domesticus
Jinguofortisidae - Chongmingia zhengi + Jinguofortis perplexus <- Confuciusornis sanctus, Sapeornis chaoyangensis
Ornithothoraces - Iberomesornis romerali + Passer domesticus
Enantiornithes - see here
Euornithes - see here

Please note that the above names and/or definitions are not meant to constitute nomenclatural or definitional acts.

Sources for cladogram include but are not limited to:

Imai et al. (2019). "An unusual bird (Theropoda, Avialae) from the Early Cretaceous of Japan suggests complex evolutionary history of basal birds"
Mayr et al. (2019). "A well-preserved pelvis from the Maastrichtian of Romania suggests that the enigmatic Gargantuavis is neither an ornithurine bird nor an insular endemic"
Wang et al. (2020). "A new jeholornithiform exhibits the earliest appearance of the fused sternum and pelvis in the evolution of avialan dinosaurs"

Description
This cladogram is speculative, but it is mostly in line with scientific studies mixed in with my own opinion; no actual phylogenetic analysis was undertaken. Feel free to comment or suggest changes, but be aware that I may reject or modify your suggestions.

Definitions for clade names:

Avialae - Vultur gryphus <- Dromaeosaurus albertensis, Saurornithoides mongoliensis
Jeholornithiformes - Jeholornis prima <- Passer domesticus
Euavialae - Passer domesticus <- Jeholornis prima, Rahonavis ostromi
Avebrevicauda - Passer domesticus + Sapeornis chaoyangensis
Omnivoropterygidae - Omnivoropteryx sinousaorum <- Passer domesticus
Elopterygidae - Balaur bondoc + Elopteryx nopcsai + Gargantuavis philoinos <- Alvarezsaurus calvoi, Hesperonychus elizabethae, Passer domesticus, Scansoriopteryx heilmanni
Pygostylia - Confuciusornis sanctus + Passer domesticus
Confuciusornithiformes - Confuciusornis sanctus <- Enantiornis leali, Passer domesticus
Jinguofortisidae - Chongmingia zhengi + Jinguofortis perplexus <- Confuciusornis sanctus, Sapeornis chaoyangensis
Ornithothoraces - Iberomesornis romerali + Passer domesticus
Enantiornithes - see here
Euornithes - see here

Please note that the above names and/or definitions are not meant to constitute nomenclatural or definitional acts.

Sources for cladogram include but are not limited to:

Imai et al. (2019). "An unusual bird (Theropoda, Avialae) from the Early Cretaceous of Japan suggests complex evolutionary history of basal birds"
Mayr et al. (2019). "A well-preserved pelvis from the Maastrichtian of Romania suggests that the enigmatic Gargantuavis is neither an ornithurine bird nor an insular endemic"
Wang et al. (2020). "A new jeholornithiform exhibits the earliest appearance of the fused sternum and pelvis in the evolution of avialan dinosaurs"