score:1
In general if you are traveling on one ticket, with both a domestic leg and an international leg, the international rules override the domestic rules. So when you check in, you are checking in for an "international" flight and the check in counter agents need to document your permission to enter (passport, visa, etc) the international destination.
But the three hour suggestion, is just that, a suggestion not a rule. You really need to judge based on the airport and procedures.
Check in will take longer, as the agent needs to check your travel documents and to enter into their computer any government mandated info. Of course if you are flying to some obscure destination like Tuvalu, you might need to allow a bit more time for the check in agent to figure out where the heck it is and the rules.
The rest of time considerations are the same as a domestic flight for that particular airport.
Upvote:1
No.
The only difference over a pure domestic itinerary at the first stage is that there will be a bit of extra time at the check in desk if (a) you have some weird through-check-in problem with a partner airline down route that day and (b) visa/passport checks.
The other thing is that the "three hours required" thing is a bit of a myth.
In some airports, particularly where there are lengthy, bureaucratic and chaotic exit controls (India, parts of South America) then you really will need that much time at the international exit point. But you certainly wouldn't at the domestic part of the journey.
In my personal experience; in Europe or the US, where taking an international plane is not much different to taking a city bus, it is rare for me to be at the airport more than sixty minutes before departure. Life is too short to spend it at the airport.
If you are checking a bag many airports will not accept economy passenger baggage more than three hours ahead anyway.
The main reasons, I think, for the "three hour recommendation" is (a) so you cannot blame the airline's guidance if you arrive at the airport slightly too late and (b) to give you more time to do shopping in the airport. On those two points you probably will be "recommended" to appear as early as possible.
Upvote:4
It's very simple β since you won't be passing through immigration on your outbound leg (assuming an intra-Schengen flight), the first leg you are taking is not international. Same applies for other modes of transport - just because I take a flight to the US after taking the train to the airport doesn't mean it's necessarry to arrive to the train station 3 hours beforehand.