Rnigma recalled: said:
In the '70s he hosted a series for public TV, "Lowell Thomas Remembers," which used plenty of Movietone footage.
The series (eventually) reviewed every year from 1919 (when Movietone began newsreel production) through 1975 (the episode reviewing 1975 aired just one year later). Movietone ended domestic newsreel production in 1963; the episodes reviewing 1964 through 1975 likely featured film from a TV network's news archive (could it have been CBS News, given Thomas' connection to that network??) and perhaps overseas newsreel sources as well.
Besides more money, I think Thomas may have jumped to CBS because he wanted to be part of what by 1946 was considered radio's best news team. And after the war, Ed Murrow had (briefly) moved into an executive role at CBS (but in 1947, he'd leave his executive post and return to the air) so Murrow may have played a part in recruiting Thomas.