What is that we do not have available for the 101T MTOW version?
I see that the fuel load is designated for the RCT+ACT version, making the range to payload calculation quite easy. If I remember correctly, for every additional ton in gross weight over a baseline, it should be 30-40kg/hour additional fuel flow for the A321.
I think the Devs are going to “guesstimate” it like you’re doing. The XLR has a different body shape under the wing, and strengthening along the fuselage and Landing gear, so its characteristics will be different to a NEO/LR etc
All the work for them is already done. They have to be tested among the others updated.
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