It's Always Sunny in Philadelphia originally aired on a channel launched on June 1, 1994.
FX ( originally an initialism of `` Fox Extended '' , pronounced and suggesting `` effects '' ) is an American basic cable and satellite television channel launched on June 1 , 1994 , based in Los Angeles , California and owned by 21st Century Fox through FX Networks , LLC . It 's Always Sunny in Philadelphia is an American television black comedy sitcom that premiered on FX on August 4 , 2005 .