Even with a fast digesting protein such as whey, it can take hours for the leucine in whey to be liberated from the protein & enter circulation; therefore leucine concentrations in the plasma never spike to high levels.
Rating Newest Oldest. Best Answer: The absolute minimum age for flying alone on major airlines in 5 years old. Passengers who are ages 5-14 and are flying alone (without a companion who is at least 15 years of age) are considered Unaccompanied Minors (UM's). Passengers whose ages range from 15-17 are considered Young Adults and do not have to use the UM service, but can if they would like to.
Young adults may travel alone on American Airlines, though they are required to use the unaccompanied minor service if they are younger than 15 years old. A young adult who is at least 15 may be booked as an unaccompanied minor, but you also can book him as a regular passenger. You cannot buy a young adult a ticket without an adult if their travel requires a connection to another airline.