In fact, N120DL is showing on airframes.org as a RyanAir aircraft - that would explain the ADS-B fit.
Registration Manuf. Model Type c/n l/n i/t Selcal ICAO24 Reg / Opr built test reg delivery prev.reg until next reg status
N120DL Boeing 767-332 B763 23279 154 L2J A05408 RYN [RD] Ryan International Airlines 1986 2007-12-06 N120DL active edit
N120DL Boeing 767-332 B763 23279 154 L2J EMJL A05408 DAL [DL] Delta Airlines 1986 1986-12-08 2007 N120DL to other opr edit