By the mid-30s, eggs are of poor quality, and chances of natural conception have decreased considerably, and even IVF, the professor said, struggles to make up the shortfall.
Passenger yield (Passenger Revenue per Revenue Passenger Mile) for American has decreased slightly in recent years due to competition from low-cost airlines and poor domestic economic conditions.
Domestic Passenger yield (passenger revenue per revenue passenger mile) for UAL has decreased slightly in recent years due to competition from low-cost airlines and poor domestic economic conditions.