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Karina,
If you end up crisscrossing the USA, then it may be worth taking advantage of the special discount airfaires (if they still exist) available only to non residents under the "Visit USA" and "Visit North America" fares for foreign visitors that are sold only outside North America. These fares usually allow unlimited travel on one (or more?) airline network within the continental USA for a limited period (say 21 days).
Full details are available in the OAG (official airline guide) or from travel agents although they don't usually publicize too much these low fares that do not generate large commissions.
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