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There is no way to know for sure because it depends on so many variables. Typically, warrants aren't checked for domestic flights but I read something recently that was talking about tying the warrant database in which the same system used for the "no fly" list which is checked for both domestic and international flights.
If they have initiated that program then you could be caught. If not, and it wasn't a crime involving violence, something at an airport or on an airplane, or some type of terrorism then you should be fine.
I don't think it would have been implemented yet because it is a huge undertaking and when they do it you will hear people griping about it on the news channels and on the websites.
Many warrant aren't even entered in the national warrant database. One thing you could consider doing is hiring a private investigator to have one of their contacts check to see if you are even on the national warrant database. If you're not on there then you can be sure that you're not on anything for the airlines. If you want to be extra safe then hire a lawyer to hire the private investigator because the lawyer can't be compelled to give out any information abut you whereas a private investigator can be subpoenaed and forced to testify. It's incredibly unlikely that he would be and it's probably overkill to go through these extra steps.
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