Upvote:1
This proposal has the same problem as your earlier idea of transiting via the UK (Do separate tickets satisfy the UK's DATV transit requirement for an onward ticket?)
When you board in CMB, your Emirates itinerary will only take you to PTY (Panama). Emirates will want to ensure you meet the requirements for Panama.
Either:
Upvote:19
I strongly recommend against double booking.
For most airlines this violates the contract of carriage, so they have the right to cancel and they typically do.
You can find Copa's contract of carriage here: https://www.copaair.com/en/web/us/contract-of-carriage
In section 4.5.1 (c) it states
4.5.1. Reservation Cancellations. A reservation may be cancelled for the following reasons:
(c) By the CARRIER when a duplicate reservation is detected; in other words, more than one reservation for the same person for the same flight numbers.
Upvote:24
It'll likely depend on the airline, but I accidentally did this a few years back with Qantas - forgot I'd booked a flight, so booked it again. Qantas noted I had two seats on the same flight, and 'helpfully' cancelled BOTH of them. So a bit of a risk.
Also even if it lasts until the day, if the person for the second/third seat hasn't checked in for that seat, they may offer it to those on a waitlist.
Short version - I'd call the airlines and get the answer in writing before risking it.