Why Is Lufthansa Still Flying Two Different Boeing 747 Variants?

#Boeing #Airbus #Singapore Airlines #Lufthansa #Boeing 747-400 #Boeing 747-8 #Frankfurt Airport #PW4000 #CFM #Mumbai Airport #Los Angeles International Airport #Bengaluru Airport #San Francisco International Airport #Delhi Indira Gandhi International Airport #Shanghai Pudong International Airport #Nairobi Airport #Incheon International Airport #747-8