Which airlines will announce bankruptcy by December 31

Frontier Airlines - No 6939 1.02

Frontier Airlines - Yes 6939 13.60

Alaska Airlines - No 6939 1.00

Alaska Airlines - Yes 6939 34.00

American Airlines - No 6939 1.00

American Airlines - Yes 6939 30.00

Allegiant Air - No 6939 1.00

Allegiant Air - Yes 6939 25.00

JetBlue Airways - No 6939 1.01

JetBlue Airways - Yes 6939 17.00