[Scoundreller]

Assuming you can regularly land with your fuel tanks half-full. You could overbuild everything to support that, but usually airlines don't want to pay for a niche design to support that. I'd bet military aircraft do get that treatment though.

[sandworm101]

It is actually rather common. Many airlines running shorter flights will not refuel at every stop. It saves time on the ground, which can be more valuable then fuel.

[Scoundreller]

rather common amongst (ultra)-long voyages?