Sure.
"Connally, for reasons that are still in dispute, was absolutely insistent upon holding the luncheon at the new Trade Mart, near the airport along the Stemmons Freeway. Kennedy and O'Donnell wanted to hold it at the Women's Building, near the Fairgrounds. The Secret Service concurred, believing that the Women's Building would be easier to secure. Connally perhaps wanted to limit the size of the crowd, excluding as many of Yarborough's supporters as he could. Yarborough pushed for the larger Women's Building. In the event, Connally got his way, threatening to pull his support if the Trade Mart was not chosen. O'Donnell felt he had no choice but to go along.(12)"12 Reston, p. 642 (excerpt from Jerry Bruno's diary)
http://mcadams.posc.mu.edu/dallas.txt
doesn’t say anything about selecting the route.