So… I thought about tankers lately.
AFAIK most tankers do have access to all their fuel load for themselves.
So, that should possibly give a plane like, say, a KC-135 a ginormous range.
Does anyone of y’all know just how far it could fly?
Also a related question: Can a KC-135 land with a full load or would it have to dump fuel because it would exceed the maximum landing weight? I guess the latter but I am not sure.
My purely speculative guess would be that this is less of an issue for tankers than for fighters.
Fighters are designed to be able to take off with both weapons and fuel that they are supposed to use up before landing again.
Big passenger/transport jets may have to dump fuel to be able to get to their landing weight, but they normally don’t drop their cargo or passengers during the flight. So for all of the “cargo weight” that is taken up by fuel in the KC-135, it should be possible to bring that back without dumping it.
But maybe @ST0RM can say something about this if he’s allowed
The USAF website states that the max ferry range is as follows:
ferry mission, up to 11,015 miles (17,766 kilometers)The USAF website has this number for MTOW:
Maximum Takeoff Weight:** 322,500 pounds (146,285 kilograms)And a doc on the USAF website has this for max landing weight:
The maximum landing weight for the KC-135 is now 235,000
pounds
So it would need to lose 87 500lbs of weight if loaded to MTOW before it can land. However, its empty weight is 98 465lbs while its maximum fuel capacity is 200 000lbs. So to reach MTOW you’d need to max out on fuel and still add 24 035lbs of cargo to it. If you would only fuel it, you’d only need to dump 63 465lbs to reach maximum landing weight.
This is all based on public info I could find, thanks for the little sidequest 
Someone like @ST0RM will obviously know better than me.
IIRC the KC-135 has a standpipe that prevents the receiver from sucking it dry.
The KC-10 does not, and could theoretically give practical all of its fuel until flameout.
Just from memory, so I’m open to being corrected.
ETA: Wait, that was the opposite of the question being asked. Yes, both tankers can (I believe), use all of their fuel themselves. Both would have to dump prior to landing if full.
Only as long as passengers are worth more than fuel.
Hey, it was shower thoughts, right? 
Ladies and Gentlemen, we have experienced a technical problem that forces us to turn around and land. Sadly we are too heavy to land right now, so we will dump 100 passengers.
Please remain in your seats for now, and wait for the crew to hand you your personal chute and give you further instructions.
Thank you for your understanding.
At least you get a parachute or is that chute like a slide so you will exit the aircraft more rapidly? 
Wheels
Remember the Alamo! 
Who knows!? 
Only in 1st or business class… Economy passengers, how fast can you flap your arms?
Your seat cushion may be used as a personal [impact protection] device.
We used to have a 225k max landing weight limitation, but that has been increased to 235k and possibly more. I need to check.
But yes, we’d have to dump, or “adjust gross weight”, to bring us to that number.
EDIT: Apparently it can be landed at full max load (emergency), but is limited to a tight sink rate of 240ft per minute instead of the more common 700-800.
No-one remembers the Alamo, then?
And I’m guessing a pretty involved overweight landing inspection afterwards.
I got it!
I wasn’t certain it was appropriate any more, but I laughed my balls off, then felt guilty. Then had a snack and felt better. 
