I found this idea on the Infinite Flight Forum(mobile flight Sim).
Here you can create your own airline . Make sure no one else is using it first though. You can announce routes order aircraft and anything else airline related. If you want you can create a aircraft manufacturer and other people can order you aircraft however it must be realistic. You can’t have a plane with one door that is the same size as a A380. It just doesn’t happen. I will stand in for the real life manufacturers but if you have a made up manufacture you are on charge of it. If I order aircraft someone else can stand in for me. If you want you can make a logo, liveries and templates, but are not required.
Only use an airline if no one else is
Announce you are going to order an aircraft before you add it to your fleet and wait until order is confirmed before adding it to your fleet. You can start with a fleet at first though.
You can form alliances with other airlines or join a current one.
Routes and aircraft must be realistic.
You must have hubs for your airline.
You must only order a new aircraft if it is still in production.
You must announce important things to do with your airline.
You must announce you are using a name before you start.