Many passengers do not know who to consult or make a claim to some doubts that arise before or after traveling, or any inconvenience that may occur.
Listed below are topics that need to be consulted, coordinated or resolved directly with the airline.
Check in procedure
Documentation and visa required
Baggage weight limits, restricted and prohibited Items
Baggage and excess billing rates
Requirements for minors traveling alone or without parents
Special passengers needing prior coordination with the airline: people with disabilities, reduced mobility and pregnant women
Lost, delayed or damaged baggage reclaim
Possible flight's changes of date or cancellations
Confirmation of flight schedules (departures or arrivals)
Flight status report (for possible delays, cancellations, rescheduling)
In case your airline reschedules your flight, coordinate with the company for possible compensation, due to extra nights accomodation, food, flight connection lost, etc.
Remember that it is always advisable to have a traveler's assistance insurance, in case the airline does not respond to any inconvenience that might happen (baggage lost or damaged, cancellation or flight delay, etc.)