Goin' US Texas this weekend

Flyin' to US Texas this weekend for international conference. I gotta present one of the research work to over hundreds of ppl from all ard the world. Up to now i've not finished my preparation. :( Went sushi wif Chongyan again this evenin'. My sista is goin' US too, she is takin' first class seat (over S$10,000) ,while i m takin' economic class seat (S$2000) paid by the sch. :( See the diff? No choice... i'm a student.