The Edge of Glory, according to ATRL

appearently Judas for gaga stans

Well, it didn't REALLY flop, but Moment 4 Life.
It was on the radio ALL THE TIME. I was almost sure it broke into the top 10.

Run tha World
Love On Top
Countdown
Best Thing I Never Had
Party
Marry the Night
Judas
California King Bed
Man Down
You Da One

My radio stations don't really play like straight off the Top 20 list. Sometimes I question the songs they have on rotation constantly.

Check It Out by Will.i.am, the video was always on tv

I'm A Slave 4 U by Britney apparently only went to like #20something yet it's known as one of her biggest hits.

Same for Holiday by Madonna.

most of Britney's early singles

Was played ALL the time on my local station. Thought it was a hit

Love You Like a Love Song
If You Seek Amy
California King Bed
You Da One and Talk That Talk (both of which are still heavily played)
...... I'll edit my post when I can think of more off the top of my head..

With the way that "You Make Me Feel..." was played on Atlanta radio, you'd have thought it went number one on the Hot 100. It wasn't a flop by any means, but still.

Also, "Stereo Love" and "Heartbreak Warfare" are still played quite a lot, but never went Top Ten.

With the way "Mr. Saxobeat" was played you would think it was a global #1.

All I Ever Wanted by Kelly Clarkson. Didn't even chart on the Hot 100. But by the way it was played on New Jersey Hot AC radio, you would've thought it at least went top 20.

Thank god I stopped listening to Hot AC in 2010. Top 40 & Urban all the way!