Scope in a contractual text defines what the airline is allowed to do as far as flying operated by pilots that are not part of said airline's seniority list.

On the strict end you have southwest where code sharing (selling a few tickets on another airline's flight) is completely off-limits.

Most major airlines have scope that allows a certain amount of code sharing (usually limited to a far minority of a given flight) as well as regional flying where a contract carrier operates a smaller plane than the primary airline operates. Especially in the latter there will be limits on seating capacity as well as number of aircraft. Sometimes this is tied to the size of the mainline fleet.

On the lax end you have Alaska which does not have any scope restrictions, which means that Alaska could send 737s to Horizon if they were so inclined. I believe Midwest did not have restrictions either which resulted in Republic taking 100% of their flying by the end.



Credit is what you're getting paid. Block Hours are what you actually flew (or what was scheduled in the case of "Scheduled Block"). Most airlines have a Leg Value which is a minimum amount you will get paid to operate the flight based on average flight times (real world, not what the flight is scheduled to) to make your pay more predictable. This protects you on the rare days that you are very early due to winds or other circumstances. Some airlines also operate where you don't start getting paid extra from that time until you are x minutes over the leg value.



A Hub Turn just means operating a pair of flights out of and back into a hub. Such as flying CLT-BNA-CLT for a pilot flying for American.



On-call times varies airline by airline.

For short call you'll be FAR limited so it's generally 10-12 hours maximum per day. Many regional airlines only operate short call or Ready Reserve. Ready reserve is an assignment to sit at the airport in case needed on extremely short notice. Not all Mainline carriers even have ready reserve but most regionals do (if not all of them).

For long call you are usually on a 10-12 hour callout, which means the airline puts you into rest upon assignment and you are otherwise on call 24hrs/day except for days off.

Days off also vary by airline. On reserve at a regional you can expect 10-12 days off a month depending on their contract. At a major it might be 14. Days in a row is something you can bid for (bidding is a seniority based scheduling system carried out prior to each month). Days in a row also vary by airline. Some airlines only let you schedule 5-6 days in a row so you have a scheduled day(s) off to meet FAA requirements. Others will allow you to work as many in a row as you want and they will assign a period of time off if needed to meet the requirements.