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.
Children (2 years or older) Once a child has reached their second birthday, the child is required to have a purchased seat at an adult fare. Children under 5 years of age may not travel alone under any circumstances. Infants (under 2 years) We accept infants as young as 2 days old. However, if you're traveling with an infant less than 7 days old, your physician will be required to fill out a passenger medical form before your flight.