I have the following itinerary from Amadeus, what does the lines starting with code 050, 010 mean?

1  EY1998 M 18DEC 4*DUSAUH DK1  2105 0635  19DEC  E  0 332 M                  
   050 AB 7460                                                                
   OPERATED BY AIR BERLIN                                                     
   SEE RTSVC                                                                  
2  EY 204 M 19DEC 5*AUHBOM DK1  1545 2025  19DEC  E  0 320 M                  
   010 9W 6519 /AB 4092                                                       
   SEE RTSVC                                                                  
3  EY 203 L 11JAN 7*BOMAUH DK1  2140 2340  11JAN  E  0 320 M                  
   010 9W 6520 /AB 4093 /AZ 5788                                              
   SEE RTSVC                                                                  
4  EY 005 L 12JAN 1*AUHMUC DK1  0225 0615  12JAN  E  0 333 M                  
   010 9W 6362 /AB 4007 /BT 5729 /GA 9068 /HM 5026 /TP 6919 /UL               
   SEE RTSVC