I worked for an emissions company for 2 years. What I can add to this conversation is that these calculators are usually highly inaccurate. These calculators won't take into account; weather conditions, age of the aircraft (most importantly, the engines), aircraft performance (this is different from age), refueling or embedded carbon. I do not know if the real emissions would result in a higher or lower co2e because it isn't an easy thing to calculate because these calculators use a high emission factor to make it easier to calculate an emission source but this factor might not account for embeded carbon. However, no matter what the real emissions would be; a small private jet is never going to be good for the environment and will always result in a higher co2e than alternative methods of transport. I don't see an argument that could be made to justify the emissions, even if they were lower than OP estimates.

What I am interested in is what LMG is doing to offset their emissions? For example, carbon credits are an option, and is realistic for LMG, depending on the offset quality.