DGD wrote:
So, just out of curiosity and assuming the SJO flight did get re-routed to Liberia, what are the most likely reasons?
Most common reason is weather which has caused visibility to be below published limits or has restricted visibility causing arrival delays. This would cause flights to seek an alternate airport if they lack enough reserve fuel to wait out the expected clearing of the weather or the anticipated amount of the delay. This was a somewhat frequent occurrence at SJO before the new approach lighting was installed. Based on the weather at SJO this time of year that scenario would be a real stretch.
A very remote possibility is a incident at the airport that resulted in the runway being unavailable for flight operations. SJO having only one runway there would be no alternate should an incident close the runway. There appears to be reports of any such incident at SJO recently.
Some airport restrict operations when a VIP is scheduled to be arriving or departing the airport. Again no mention of that at SJO lately.
Certainly not the case here but there are times when a mechanical problem occurs in flight and the aircraft is diverted to an airport where the carrier has maintenance facilities and staff who can handle the problem. That is when at the original destination airport the carrier lacks the staff and facilities to handle the anticipated repair.
Another case, not relevant here, is when an emergency occurs in flight and the destination airport lacks the physical capability or the human resources to handle the emergency and the flight is diverted to an airport better equipped to handle the emergency.
There are other situations I am sure that will come to me when I really think about it but these come to mind immediately.
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