The crosswalk was part of a larger memorial for the 49 people who were shot and killed at the gay bar in Orlando in 2016.
Almost 300 people were on board the flight that was scheduled from Orlando to Atlanta, the airline said.
Passengers have been forced to evacuate a Delta plane after an engine caught fire while on the tarmac at Orlando International Airport in Florida.
Tyre Sampson fell 30m (98ft) from the ride at ICON Park in Orlando which had no seat belts.
Dreamlight takes children with a serious illness or disability on holiday to Orlando.
Video shows the chaotic aftermath of the shooting on an Orlando street packed with revellers.
The family are hoping to celebrate their youngest daughter beating leukaemia while in the US.
Deadly winds of up to 165mph (270km/h) are expected to batter Florida later on Wednesday.
Talented rower Anna Beaumont, 13, is described by family as a "beautiful soul" who will "never be forgotten".
