US Airports are not separate like most Australian airports are. International and domestic departures often leave from the same terminals, as the US does not have as strict physical controls as Australia does. Airline departures are done as you have surmised by the airlines, via the APIS system.
So your conclusions are correct. You will land at LAX Terminal ...
The quickest way will undoubtedly be by London Underground and DLR. The simplest and also quite cheap route is to travel from Notting Hill Gate station on the Central Line to Bank, where you can change onto the DLR to reach London City Airport. (If you REALLY want the absolute cheapest you can head West from Notting Hill Gate via Shepherd's Bush, the London ...
TSA has size restrictors (the grey metal rectangle) in front of their hand baggage X-ray machines:
(Source: Wikimedia commons)
If your suitcase can fit through the size restrictor; then you could conceivably bring it all the way to the gate. TSA itself doesn't list any restriction on the size of hand luggage - they defer to airlines, however most ...
I have bags
As noobservergirl points out, the obvious route from Notting Hill Gate to London City Airport is the Central Line to Bank, then the DLR to London City Airport.
The trouble is that while the DLR is modern enough to have lifts and level access throughout, the Underground is still mostly stuck in the Stone Age accessibility wise, with no lifts ...
I like to use Rome2Rio to get a quick overview of multiple transportation options between two points, whether within a city or across the world. By default it will display results broken down by mode of transportation, and for each mode, showing the estimated time and cost. For each mode, you can click on it to get more details such as the exact routes and ...
An update for the beginning of 2020. The National Express's website says:
For airport journeys we recommend allowing at least 3 hours (180 minutes) between your coach arrival time and scheduled flight.
So 40 minutes margin is certainly too small as per website operators.
46 mins using underground via central line from Notting Hill Gate, and then change onto the DLR at Bank station.
If you're heading during off-peak hours (ie early in the morning or late in the evening), then there will be less traffic but I would predict it would be a slightly shorter journey.
I use the CityMapper app. It gives you estimated timings using ...
Note: This answer specifically refers to public transportation options, as it is assumed by default that Manhattan traffic + Lincoln Tunnel traffic will be horrendous. As noted by phoog in the comments, airport shuttles and taxis will likely be faster than public transportation when traffic is low.
From 78/2nd to Newark, the most effective way to go by ...
Sälen Buss offers bus transfers that must be booked in advance.
You also have the option to transfer on snow with either dog sleds or snowmobiles.
Of course there's also taxi, charter busses for groups and rental cars.
All options are listen on the airports website.
I took the foot bridge, flagged down a taxi. Price to Nichols was the same as Grab.
The train ride was free because they were testing a new train set (nice), but it was not on time - even by Filipino standard: 100 minutes delayed. It may have been due to flooding, but I will be reluctant to use the train when going to NAIA.