Not as easy as you might think. Entry level pay is not very good, and major airlines won't be hiring in large numbers for a couple more years.
I don't know... I race with a lot of airline captains - a lot are South West but other carriers as well - and they see not enough first officers coming through. Don't know how the regionals are doing... that's where a lot of the major carriers get their FOs from: right seat regional, left seat regional, right seat major, Captain.
Alternatively, Military, right seat major, Captain.