Based on that, he must have obtained a special permit to leave Palestine and fly to the US for higher education, but this had to be approved by Israel or he could not leave Palestine or transit through Ben Gurion Airport (remember the Palestinian's international airport was bombed into rubble a decade ago or so). One year they denied him for some Kafkaesque reason, I presume. By the time he sorted it out he had to arrange with the school to take a leave and start again the next quarter