There are darker ways he could have traveled to Pakistan than the one you mentioned... and easier ones. He could have traveled to another country that didn't have a problem with Pakistan and flown from there... Or he could have flown under a fake passport provided by people we don't want to know about ... Didn't Oswald fly to Russia? Not saying that what Obama did was illegal. It's unlikely... odd - if you pin it down - ping me.
No. Ship to LeHarve, France. Ferry to UK, where he states he will be staying a week before going to school in Switzerland. That afternoon he flew to Finland, where he applies to the Soviet consulate for a visa. A week later he enters Soviet Union by train.