I have got 74% in 11th std. Is this score enough for aeronautical engineering in USA and also for getting admission in good universities?

Dear Sathvik, Universities in US holistically evaluates applicant's profile. They will evaluate your grades, all round activities, extracurriculars, SAT scores and so on. Your grades according to Indian percentage system is good enough. You must also take SAT, your SAT scores will be very important