List of Airlines at (ULN) airport

Aeroflot (Tel +976 1132 0720 / 7004 9595 - Monday to Thursday from 8:00 am to 6:00 pm, Friday from 8:00 am to 4:00 pm, weekends from 10:00 am to 1:00 pm)
Aero Mongolia (Tel +976 1128 3212 / 7004 9943)
Air Busan (Tel +976 7004 3050 / 3060 - weekdays from 9:00 am to 5:00 pm)
Air China (Tel +976 7000 9932 / 9933 - Mondays through Fridays from 9:00 am to 5:00 pm, weekends from 10:00 am to 1:00 pm)
Hunnu Air (Tel +976 7000 1111 - Mondays through Fridays from 9:00 am to 6:00 pm, Saturdays and Sundays from 10:00 am to 5:00 pm)
Korean Air (Tel +976 1131 7100 - weekdays from 8:30 am to 5:30 pm)
MIAT Mongolian Airlines (Tel +976 1133 3999 - 24 hours a day)
Turkish Airlines (Tel +976 7014 6161 - weekdays from 9:00 am to 6:00 pm)

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.)