What is the test for reasonable searches and seizures under the fourth amendment?

Under the fourth amendment, only unreasonable searches and seizures are prohibited. The determination of reasonableness requires a balancing of an individual's right to be free of intrusive searches with society's interest in safe air travel. "What is reasonable depends upon all of the circumstances surrounding the search or seizure and the nature of the search or seizure itself." United States v. Montoya De Hernandez, 473 U.S. ----, ----, 105 S.Ct. 3304, 3308, 87 L.Ed.2d 381, 388 (1985).