A few comments on the above posts:
Will an A400M be able to tank at a reasonable speed/altitude or will it have to do it whilst descending?
There are very few available/suitable A310s and they are costly to support.A lot of their avionics is becoming outdated and the A300/310 family do not age well.
An A330 can hold 112 tonnes of fuel in its tanks-this is twice the fuel capacity of a 310.It can achieve an altitude of 35000 feet and a speed of up to 0.86 with this fuel load.A 310 will be altitude limited and can only do a max of 0.81.
The 330 is a far superior aircraft and would be my choice.
Will an A400M be able to tank at a reasonable speed/altitude or will it have to do it whilst descending?
There are very few available/suitable A310s and they are costly to support.A lot of their avionics is becoming outdated and the A300/310 family do not age well.
An A330 can hold 112 tonnes of fuel in its tanks-this is twice the fuel capacity of a 310.It can achieve an altitude of 35000 feet and a speed of up to 0.86 with this fuel load.A 310 will be altitude limited and can only do a max of 0.81.
The 330 is a far superior aircraft and would be my choice.