18 to 36 months depending on your speciality.
Motorcycle School? Do you mean a motorcycle mechanic? Depends if you go to school full time or part time.
an airplane mechanic because going to school is free.
No there is not a school like this online. If you are interested in becoming a NASCAR mechanic, you will have to take regular classes.
To be a mechanic, you should have a certificate. To get most of these, you just have to pass a test.
You can learn what is a good diesel mechanic school at web site http://www.mechanicschools.com/ and http://www.indeed.com/forum/job/diesel-mechanic/schools-US-good-schools-Diesel-Mechanic-training/t144829.
Following an Electo mechanic or mechanic course in school.
There are several airport mechanic training schools across the United States. Sites like collegebound.net can be used to find a local airport mechanic school.
Where is it?
Depending on what company you work for, there is a reasonable amount of money to be made as a mechanic. You can learn to be a mechanic at a school like ITT Tech.
Master mechanic are guaranteed for 3 months.
If you are looking for more information on Where can I find an auto mechanic school in Houston, the best place to look for the information is on education-portal.com/auto_mechanic_schools_in_houston.html
If you do have to go to college you won't need to be there long. How ever depending on where you plan to work you may be able to not go to college but use your high school shop classes as your education.