United Airlines will bid farewell to its fleet of iconic Boeing 747 jumbo jets by this year end, against earlier plan to retire the fleet by the end of 2018.
With the advent of fuel efficient and cost-effective twin jets like the Boeing 787, the four engined 747s have become expensive to operate.
The airline has currently 20 Boeing 747-400 in fleet and first flew the type in 1970 between California and Hawaii
The type will be replaced by the Boeing 777-300 ER slated to enter service this year.
The 777-300ER will be capable of seating 366 passengers and all the 14 aircraft on order will enter United service in 2017.