 The west coast experienced a remarkable proliferation of nonscheduled passenger airlines, especially near Los Angeles in places like Burbank or Long Beach where land for a dirt airfield could be cheaply obtained.On the east coast Newark and Trenton in New Jersey were popular hangar bases for non-skeds, and the Miami-Caribbean circuit out of Florida was as trafficked as it was lucrative.One route, from San Juan to New York, facilitated the mass migration of Puerto Ricans seeking opportunity on the mainland who came in numbers exceeding 6,000 each month and settled in squalid conditions in East Harlem.