Arg0:causal agent
Arg1:thing actually doing the flying
Arg2:benefactive
| unaccusative, traveller as subject (-) | |
|---|---|
|  | |
| Arg1: | he | 
| REL: | flies | 
| ArgM-DIR: | around | 
| ArgM-LOC: | in Columbia's jet planes | 
| transitive, pilot as subject (-) | |
|---|---|
|  | |
| Arg0: | *trace* -> the pilots | 
| REL: | fly | 
| Arg1: | UAL's two new Boeing 747-400 aircraft | 
| intransitive, pilot as subject (-) | |
|---|---|
|  | |
| Arg0: | Pilots | 
| ArgM-DIS: | as well | 
| REL: | fly | 
| ArgM-MNR: | overtime | 
| ArgM-PNC: | to ensure that none are furloughed during seasonal lows | 
This is a hard one; it can be very difficult to determine if a subject is a pilot or a traveller. When in doubt, go with traveller.