No comparison...... AA by a big margin. My friends who are Top Level Medallon on Delta are all fairly upset with the restrictions placed on First Class upgrades. Most arent getting them anymore and dont know when the ticket they purchased qualify.
I cannot say enough about working with the EXP desk. Lots of TLC from those guys has gone a long ways with me....
Right now I cannot even stand to fly on CO and I have a fairly high status with them, their service absolutely is terrible... I could go on and on there.....
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AA member since 1981