3rd Place: Delta, because of their service in comparison to some othe airlines in the US.

2nd Place: Aer Lingus, because that is what I fly when I go to Europe.

1st Place: Continental, for the same reason as Delta their service in The States is unrivaled.

Even though this isn’t part of the question but,

Last place goes to the Domestic operations of Northwest. their international flights are barable but the domestice flights are unbelievable.

I think that the 737NG and the A320 are basically the same. Both airplanes have there pros and cons. A decision about which one your airline will fly should be based on the cost.

I have noticed that many of the start up low-cost airlines prefer A320s, maybe its down to 3 reasons i can see

1. Economics involved, maintenace costs may be lower!!
2. The issue commanality, the same pilots, crew and maintinece guys will be familier with the A318, A319, A320 and A321 series of aircraft
3. Safty records, whats the safty record of A320s compared to 737s without fly-by-wire systems?

1. The cost can vary depending on the airline. Why would Ryanair operate the 737 if the 320 was cheaper.
2. the 737-600, 737-700, 737-800, and the 737,900 all have the same commonality as the 320 series.
3. The 737NG has a great safty record other wise why is it still flying with over 60 carriers.