If your trip includes flights operated by other airlines, then your checked bags will be considered “interline baggage."
Interline baggage just means checked baggage that will be transported by two or more airlines.
There is a policy valid for all IATA (International Air Transport Association) airline members to calculate the baggage allowance of inter-airline flights using the concept of the Most Significant Carrier (MSC) in order to determine whose baggage rules to use in an interline itinerary.
Based on this policy, Copa Airlines take into consideration the following criteria:
- If the geographically longest or most significant stretch of your journey is not operated by Copa Airlines, but by another airline, this airline's rules may also apply to Copa Airlines flights or Copa Airlines flight numbers.
- If Copa Airlines operates the geographically longest or most significant stretch of the journey, then the Copa Airlines rules and charges apply.
For more information visit the Baggage Policy section.