we have a "domestic" CO2 meter which didn't cost a huge amount. A quick look inside shows that the circuitry is not protected against damp environments and there are a number of components which are not braced to resist vibration. I would guess that an aviation unit would have these basic things dealt with. The temperature range seen in an aircraft cocpit also excedes the spec on the unit we have, at both ends of the range.
You pays your money and makes your choice.
Rans6....