Stock Price Trends

Delta Air Lines Inc (DAL)

Delta Air Lines, Inc., typically referred to as Delta, is one of the major airlines of the United States and a legacy carrier. It is headquartered in Atlanta, Georgia.

Stock Price Trends

Stock price trends estimated using linear regression.

Key facts

  • The primary trend is increasing.
  • The growth rate of the primary trend is 28.36% per annum.
  • DAL price at the close of April 1, 2025 was $42.42 and was lower than the bottom border of the primary price channel by $4.27 (9.14%). This indicates a possible reversal in the primary trend direction.
  • The secondary trend is decreasing.
  • The decline rate of the secondary trend is 94.77% per annum.
  • DAL price at the close of April 1, 2025 was inside the secondary price channel.
  • The direction of the secondary trend is opposite to the direction of the primary trend. This indicates a possible reversal in the direction of the primary trend.

Linear Regression Model

Model equation:
Yi = α + β × Xi + εi

Top border of price channel:
Exp(Yi) = Exp(a + b × Xi + 2 × s)

Bottom border of price channel:
Exp(Yi) = Exp(a + b × Xi – 2 × s)

where:

i - observation number
Yi - natural logarithm of DAL price
Xi - time index, 1 day interval
σ - standard deviation of εi
a - estimator of α
b - estimator of β
s - estimator of σ
Exp() - calculates the exponent of e


Primary Trend

Start date: June 13, 2022
End date: March 7, 2025

a = 2.8221

b = 0.0007

s = 0.1134

Annual growth rate:

Exp(365 × b) – 1
= Exp(365 × 0.0007) – 1
= 28.36%

Price channel spread:

Exp(4 × s) – 1
= Exp(4 × 0.1134) – 1
= 57.40%

June 13, 2022 calculations

Top border of price channel:

Exp(Y553)
= Exp(a + b × X553 + 2 × s)
= Exp(a + b × 802 + 2 × s)
= Exp(2.8221 + 0.0007 × 802 + 2 × 0.1134)
= Exp(3.5974)
= $36.50

Bottom border of price channel:

Exp(Y553)
= Exp(a + b × X553 – 2 × s)
= Exp(a + b × 802 – 2 × s)
= Exp(2.8221 + 0.0007 × 802 – 2 × 0.1134)
= Exp(3.1438)
= $23.19

March 7, 2025 calculations

Top border of price channel:

Exp(Y1,238)
= Exp(a + b × X1,238 + 2 × s)
= Exp(a + b × 1,800 + 2 × s)
= Exp(2.8221 + 0.0007 × 1,800 + 2 × 0.1134)
= Exp(4.2800)
= $72.24

Bottom border of price channel:

Exp(Y1,238)
= Exp(a + b × X1,238 – 2 × s)
= Exp(a + b × 1,800 – 2 × s)
= Exp(2.8221 + 0.0007 × 1,800 – 2 × 0.1134)
= Exp(3.8264)
= $45.90

Description

  • The primary trend is increasing.
  • The growth rate of the primary trend is 28.36% per annum.
  • DAL price at the close of April 1, 2025 was $42.42 and was lower than the bottom border of the primary price channel by $4.27 (9.14%). This indicates a possible reversal in the primary trend direction.

Secondary Trend

Start date: January 27, 2025
End date: April 1, 2025

a = 18.5213

b = -0.0081

s = 0.0535

Annual growth rate:

Exp(365 × b) – 1
= Exp(365 × -0.0081) – 1
= -94.77%

Price channel spread:

Exp(4 × s) – 1
= Exp(4 × 0.0535) – 1
= 23.88%

January 27, 2025 calculations

Top border of price channel:

Exp(Y1,210)
= Exp(a + b × X1,210 + 2 × s)
= Exp(a + b × 1,761 + 2 × s)
= Exp(18.5213 + -0.0081 × 1,761 + 2 × 0.0535)
= Exp(4.3954)
= $81.07

Bottom border of price channel:

Exp(Y1,210)
= Exp(a + b × X1,210 – 2 × s)
= Exp(a + b × 1,761 – 2 × s)
= Exp(18.5213 + -0.0081 × 1,761 – 2 × 0.0535)
= Exp(4.1812)
= $65.45

April 1, 2025 calculations

Top border of price channel:

Exp(Y1,255)
= Exp(a + b × X1,255 + 2 × s)
= Exp(a + b × 1,825 + 2 × s)
= Exp(18.5213 + -0.0081 × 1,825 + 2 × 0.0535)
= Exp(3.8781)
= $48.33

Bottom border of price channel:

Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(18.5213 + -0.0081 × 1,825 – 2 × 0.0535)
= Exp(3.6639)
= $39.01

Description

  • The secondary trend is decreasing.
  • The decline rate of the secondary trend is 94.77% per annum.
  • DAL price at the close of April 1, 2025 was inside the secondary price channel.