WTC Commemorative Flag Sticker. This Commemorative Flag tastefully displays the New York City Skyline and the date Of September 11, 2001. After Sept. 11, FlagsOnCars.com was granted the exclusive patent for this design by the US government. Today, this flag continues to remember those innocents who lost their lives in the terrorist attacks and makes a great addition to your memorials or fundraisers. Size 2 inches by 3.5 inches with the words We Will Never Forget written between the stripes. Sold by the dozens.