Everton have the second longest top division membership. Without checking I believe they came up in 1954 and have only ever spent three years outside the top flight. Numero Uno are Arsenal who have been ever present since 1919.
That is more or less true. Everton have been in the top flight for more years than any other club, they have actually spent 4 years outside the top flight, one in the early 1930s and 3 in the early 1950s. I am not too clued up on Arsenal's history, but for some reason they didn't enter the top flight until many years after Everton, so although Arsenal have the longest uninterrupted run in the top flight, they don't have as many seasons in total in the top flight as Everton.
I guess the reason for you posting on this subject is that, like me, and many other people, you see Everton's top flight status under some considerable threat on current form. Given the club's summer transfer activity, we could be the first side to ever bankroll a catastrophic relegation campaign
And yes,
@AndyRM Angry birds are the shirt sleeve sponsors, wish the players would show some anger!!