I can buy the 757 on disc or download. Here is the one on disc http://www.amazon.co.uk/gp/product/B001H0GEP2/ref=s9_subs_c5_s2_p63_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-1&pf_rd_r=1SPVC0HGVQQQS7498YND&pf_rd_t=101&pf_rd_p=463374953&pf_rd_i=468294

This says it has the 200, 300 and freighter models, so what is the difference between this and the proline that I can download? I see that the proline has only the 200, with the 300 and frieghter being at an extra cost. Also, what is block B and F?