Advertising increases overall revenue. Use your advertising dollars to maximize the income from your flights. I recommend buying
Billboards on 20 international airports advertising. There is great success that has been proven by this method.
You can have 100% of your seats full on a flight that is showing only 90% demand. Keeping your seats full will always help your bottom line.
Advertising has been updated. There are more options and the cost of advertising now fluctuates. Similar to the way fuel prices change over time you can try to buy advertising when the prices are low.

Newspaper Advertising

1 tv commercial

Internet: in major search engines

Internet: in major social networks

Bus and Taxi posters

10 tv commercials + newspaper advertising

Cross country newspaper advertising

Billboards on major streets

Billboards on 1 major airport

Billboards on 20 international airports
The graph represents the prices up till this very hour. With every price change, the graph will update. The numbers represents hours (1 through 24)
The graph is meant to give an idea of the prices of the current day
You also have many options for the type of advertising you use for your route.
This is a list and description of your advertising options.