An unruly passenger caused a United Airlines flight from Newark Liberty Intl. to divert to a Virginia airport while flying to Costa Rica, officials said. United flight 1080 departed Newark airport around 8:30 a.m. and diverted to Dulles Intl. Airport in Virginia, where the plane landed around 11 a.m. The aircraft continued to the gate and the disruptive customer was removed, according to a statement from United Airlines.