They’ve announced the Aviation → DC7909 as well as the Aviation → XT60 cables but they haven’t been launched for sale yet. Until then you can do what @YardGuy suggested and use a car charging cable (cigarette lighter to DC7909) to charge your EB3A/EB70S from the B80. It’ll only charge at about half the speed @ 100W.
I feel ya. I’m in the same situation. We can use the car charger cord (12v-DC7909) to charge the power station from the B80 (only good for 100W). Better than nothing I guess while we wait for the power bank cord for the B80 to be released.
Aviation plug to DC7909 cable
Aviation plug to XT60 cable
I have asked the relevant departments about the progress of the arrival of the above two cables, and I will let you know once I have on new information.