I understand aircraft pallets, I work in the airfreight industry. What I don't understand are the figures you gave for the 2 aircraft.
You have the 332 at 27 LD
3 (I'll assume 28) but even that figure doesn't seem right at the base of 140cm's, at 14 (side by side 28) length ways gives a total of 1960 cms, or with 8 LD
9 pallets at 224 cm's plus an LD
3 at 140 a total of 1932 cm's.
By your figures the 764 takes 38 LD
2's (we use LD
8's much more efficient use of space) at the same base of 140 cms gives 19 length ways at a total of 2660 cm's, you then say you can only put 5 pallets on, which admittedly have to go length ways which is 318 cm's for the same LD
9's gives a total of 1590 cm's, what has happened to the extra 1070 cm's.
According to your figures I could put another 3 pallets on the 764 giving at a total of 8, not quite enough room for another row of LD
2's though, or I could put 7 pallets plus 3 rows of LD
2's or as we would use 3 LD8's.
If the figures you give are correct then the 764 has the capacity to carry almost the same amount of freight as the 332, admittedly probably not as far, but to say it carries twice as much as you did previously shows that you should really check your figures before making such statements. I am not saying my calculations are correct, I am just going off the figures you provided.
I will say this though, the 767 is an excellent aircraft when it comes to carrying freight, the sole drawback is the inability to carry LD
3's side by side.