PKS 1424+240: yet another masquerading BL Lac object as a possible IceCube neutrino source

We show that the blazar PKS 1424+240, which has been recently associated by IceCube with a neutrino excess at $3.3\,\sigma$ level together three other sources, is similar to first plausible non-stellar source, TXS 0506+056, in being also masquerading BL Lac object, i.e., intrinsically flat-spectrum radio quasar hidden broad lines and standard accretion disk. point out these two sources share properties, including spectral energy distribution, high powers, parsec scale possibly morphology. speculate relatively rare combination of proton-loaded jets, typical high-excitation efficient particle acceleration processes, related their synchrotron peak frequencies, might favour production sources. GB6 J1542+6129, appeared twice list associations, seems belong this sub-class, includes most ~ 20 Fermi-4LAC blazars.