The first two Kentucky Derby (gr. I) contenders arrived at historic Churchill Downs Wednesday. Dollar Bill, trained by Dallas Stewart, and Buckle Down Ben, trained by D. Wayne Lukas, arrived on a plane from Fair Grounds Racecourse.Dollar Bill was steadied and nearly went down when finishing a good fourth in the Louisiana Derby (gr. II) in his most recent start. He runs next in the April 14 Toyota Blue Grass Stakes at Keeneland. Buckle Down Ben runs in this Saturday's Spiral Stakes (gr. II) at Turfway Park.The plane was also carrying Nasty Storm, a 3-year-old filly being pointed toward the Kentucky Oaks, run May 4, the day before the Derby.