anyone has experience of interviewing in US?

3 weeks ago, my friend got a phone call interview from US and they talked around half an hour, the interviewer gave him the 2nd round interview which was appointed in March. however, the 2nd round interviewers could not come to singapore due to time conflict, therefore, they asked him to go to US for the interview. anyone got general idea if the interviewer will reimburse the airticket and accommodation? or partially subsidize whatever?