This is an article from jaunted.com describing the place to watch planes come into DFW now. This is free and romantic too!
Dallas/Fort Worth International for many years had an outdoor observation area called Founders' Plaza where locals and visitors on layovers could enjoy a picnic and watch planes come and go. Later this month, a new Founders' Plaza will open on the northwest side of DFW, with shaded pavilions and speakers hooked into a feed from the airport's air traffic controllers.
The new mini park will celebrate its rebirth with a performance by Olympic gold medalist Carly Patterson on September 17. Meanwhile, DFW is asking aviation obsessives to post photo memories of the plaza online.
Oh, and if you're not in it for the plane spotting, keep in mind that Founders' Plaza was once named the Dallas-Fort Worth area's "Best Place to Make Out."