Unfortunately, they're not.
Cartoon Network aired Looney Tunes for about two months last year, but stopped due to low ratings.
Especially the fact the cartoons were shown at 11:00 AM on the weekdays where most are at school or work. Then again, Cartoon Network mostly shows cartoons from the past decade and also experimenting with live action to keep up with Nick & Disney in the ratings.
Boomerang also doesn't air Looney Tunes.
In 1999, Looney Tunes were made exclusively by Time Warner to be shown on Cartoon Network. Big mistake since the channel would later give the classics and older cartoons the shaft while making more room for newer cartoons. Also live action programming, which the channel is trying to catch up with Nick & Disney in ratings.
There's a new
Looney Tunes show that'll air on Cartoon Network in the Fall, which looks bad from the get go and would would fade into oblivion or be a footnote of countless rehashes that are nowhere close to the originals.
Besides the network focusing on newer programming, "political correctness" is another factor...
Looney Tunes can be viewed on AOL's
Slashcontrol Kids WB site, though the content rarely ever changes and have a few repeats. Also various cartoons on YouTube.
They've been released on DVD from the now discontinued Golden Collection sets to the recent Looney Tunes Super Stars series. Though the latter caused an uproar on animation forums & also the Amazon comments page with the cartoons being shown in widescreen.