theres nothing like the Russian behemoths we see at BOM ... and quite often too... if you have outsized cargo.... apart from them... the world over... the majority of world cargo is transported by 747s... the estimated majority to the extent of 60% i think if i remember correctly.... of world frieght by air is on the backbone of 747....many classics... and recently... sad to see but... 744s as well
My vote goes to the MD-11. After PAX conversions to freighters are included it must highly rank as having the most -Fs operating as a percentage of the total amount of production frames built.