June 30,

September 30,

2023

2022

Expendable parts and supplies, net:

Expendable parts and supplies

$

38,123

$

31,913

Less: obsolescence and other

(9,392

)

(5,198

)

$

28,731

$

26,715

Prepaid expenses and other current assets:

Prepaid aviation insurance

$

3,176

$

2,618

Prepaid vendors

143

1,310

Prepaid other insurance

1,290

1,268

Lease incentives

337

352

Prepaid fuel and other

1,418

1,068

$

6,364

$

6,616

Property and equipment, net:

Aircraft and other flight equipment

$

1,041,056

$

1,260,143

Other equipment

9,452

10,420

Total property and equipment

1,050,508

1,270,563

Less: accumulated depreciation

(340,814

)

(405,309

)

$

709,694

$

865,254

Other assets:

Investments in equity securities

$

18,187

$

15,178

Lease incentives

990

1,097

Contract asset

9,149

—

Other

515

15

$

28,841

$

16,290

Other accrued expenses:

Accrued property taxes

$

4,682

$

5,866

Accrued interest

5,247

2,882

Accrued vacation

6,832

4,746

Accrued lodging

4,181

3,795

Accrued maintenance

638

1,453

Accrued liability on government payroll program

—

2,967

Accrued simulator costs

931

1,045

Accrued employee benefits

1,331

1,679

Accrued fleet operating expense

504

1,606

Short term lease incentive liability

97

97

Other

2,278

2,864

$

26,721

$

29,000

Other noncurrent liabilities:

Warrant liabilities

$

25,225

$

25,225

Lease incentive obligations

1,050

1,050

Long-term employee benefits

610

1,123

Other

1,821

1,821

$

28,706

$

29,219