airlines tickets webjet carding

[Druggg]

Greetings / Happy New Year,
I'm carding airlines tickets for a period and learned that I only can card tickets used within days. If I card it for too long time before flying it will be canceled. But I heard some guys card webjet very easily (can be above 5k dollars). They claims the tickets will not be canceled within one month. How it could be? If you can share some tips & tricks I will be great appreciated. Thanks
Dave