transatlantic....
to fly on a public airplane
I think that the best way to find the cheapest flights is to sign up at one of the websites specialized in airfare deals alerts. . However I think you can buy the cheapest tickets for autumn - but it also depends when you buy them..
From air of course
us
You cannot drive from the UK to Mexico. There is an ocean in the way.
yes...its the most cheapest way for making calls from UK to abroad
No, unless you are stopping at the US.
Find a website that sends you alerts when the prices are low or specials come up.
There are a vast number of airlines that fly to Mexico depending on where your country of departure is located. If you are flying from the UK you can choose from British Airways, Air Canada or United Airlines to name a few.
Paypal
Build it yourself from parts purchased at your local crack den
Strap it on your back and start walking.