1.In my opinion the plane is the fastest means of transport because a flight from Poland to U.S. takes less time than 'motoring' (nie, bo jak mowisz 'plane' to wymieniasz srodek transportu, tutaj tez trzeba to zrobic) or (przedimek) bus ride. Except that when 'we travelling' (popraw) by car we can stand in traffic jam which is caused BY 'ex.' (nie, tak nie piszemy for example - e.g. ale tutaj trzeba w calosci) by a car accident and if we ARE travelling by plane we won't stand in (przedimek) traffic jam. I think that travelling by plane will be longer only when the aircraft will be delayed or 'canceled' (ortog) due to bad weather.
2.The ship is the savest means of transport 'becuase' (ortog) ship 'accidants' (ortog) are very infrequent. In this case THERE is less danger of collision because (tutaj cos brak) 'it' (napisz o co chodi) isn't on the road where are a lot of car users. Ship accident only can happen when THERE 'will' IS 'be' (niepotr) bad weather.