The airplane is often used in dreams to refer to the idea of "a plan". Thus riding on an airplane would simply translate as making use of a plan. The more people there are on the plane the greater is your intensity of thought upon the use of a certain plan.
A plan represented as an airplane also suggests a plan that appears quite intelligent (as a plane flies high up). The plane can also suggest a way of thinking that may be spiritual in nature.
Whether the plan is workable or not would depend on other details provided by the dream.