Planes are checked between each flight for basic issues, have a lengthy checklist to go through before using and are often under support contract from the manuf

Planes are checked between each flight for basic issues, have a lengthy checklist to go through before using and are often under support contract from the manufacturer. If you want that level of support you need to pay for it, and you can by using other CA:s. The rest of us we can use letsencrypt.