Ownership of ABC and PBS
ABC is owned by Disney Television Group via The Walt Disney Company and PBS is owned by their member public television stations via the Corporation for Public Broadcasting.
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Longest lasting logos for the Big Four US TV networks
The Big Four comprising of NBC, CBS, ABC and Fox. NBC's longest lasting logo was used from August 26, 1985 to September 30, 2013. CBS' longest lasting logo was used from 1966 to March 1, 2021. ABC's longest lasting logo was used from October 19, 1962 to September 10, 1988. Fox's longest lasting logo was used from September 1, 1999 to August 1, 2020.
Current idents for each of these US TV networks
The networks in question being NBC, CBS, ABC, PBS, Fox and the CW.