I've wondered about background checks too, and have a few questions:

1) Often I've worked 2-3 jobs at a time and omit then on the application, since they take up too much space and are irrelevant to the job. Good or bad?

2) Speeding tickets: I've had a few, most never made it onto my DMV record since I went to traffic school. Do I still have to list them? Some were over 7 years ago.

3) What kind of information can the airline obtain regarding previous employers? If you were terminated at a job (I assume everyone has), should you even bother listing it....or just say you quit? I know honesty is important, but will a prospective employer even find out in the first place?