The sequence is an integral part of the film. Lead man Jackky Bhagnani rescues the two kids after they arrive from the Academy Awards. "Jackky can 'see' the future and he realises that the lives of Azhar and Rubina, who are returning from Los Angeles after attending the Academy Awards, is in danger. Hence, he rushes to the airport and rescues the two," Vashu Bhagnani enlightens me.
Incidentally, the kids were dressed in the same outfit that they had sported at the Academy Awards.