Which airlines will announce bankruptcy by December 31

Frontier Airlines - No 6939 1.05

Frontier Airlines - Yes 6939 10.00

Alaska Airlines - No 6939 1.00

Alaska Airlines - Yes 6939 43.00

American Airlines - No 6939 1.00

American Airlines - Yes 6939 48.00

Allegiant Air - No 6939 1.00

Allegiant Air - Yes 6939 34.00

JetBlue Airways - No 6939 1.04

JetBlue Airways - Yes 6939 11.40