On Germania's website they state a 20KG allowance which is the amount that I would go by.

Could it mean 15 kilo hold and 5 kilo hand luggage??

Could be, though I doubt it as the Germania website states that 6kg hand luggage is allowed which would then mean only 14kg hold baggage.

http://www.flygermania.de/en/legal/gcc/

You may want to check with the airline/TC for peace of mind as from what I understand Germania do not normally have regular flights out of Manchester but are just providing a dedicated plane for Olympic holidays to Greece..so there may be some special agreement about weight limits, though if 20kg is what your flight ticket says I would think that is the correct amount.

judith

i thought the same as you, that if the ticket states 20kg than that is what you get.
have emailed olympic to see what they say.may have to contact germania also.
regards tracey