Which airlines will announce bankruptcy by December 31

Frontier Airlines - No 6939 1.03

Frontier Airlines - Yes 6939 12.60

Alaska Airlines - No 6939 1.00

Alaska Airlines - Yes 6939 40.00

American Airlines - No 6939 1.00

American Airlines - Yes 6939 50.00

Allegiant Air - No 6939 1.00

Allegiant Air - Yes 6939 38.00

JetBlue Airways - No 6939 1.00

JetBlue Airways - Yes 6939 19.00