NEW YORK (TheStreet) -- Alaska Air (ALK) - Get Report, Delta (DAL) - Get Report, JetBlue (JBLU) - Get Report, Southwest Air (LUV) - Get Report and United Continental (UAL) - Get Report are the airline components of the iShares Transportation Average ETF (IYT) - Get Report. These stocks soared to all-time highs earlier this year but failed to propel the transportation exchange-traded fund, which peaked on Nov. 28.

Here's the weekly chart for the transportation ETF, followed by profiles for the airline stocks.

Courtesy of MetaStock Xenith

The weekly chart for the transportation ETF ($162.26) remains positive given a close this week above its key weekly moving average (red line) at $161.36. The momentum reading in red along the bottom of the chart is rising with a reading at 62.28.

This chart shows the bull market for transports that began in March 2009. The ETF has been above its 200-week simple moving average (green line) since the week of Oct. 14, 2011 when this average was $77.85. Today this average is at $114.46.

Alaska Air ($65.77) is up 10% so far in 2015 and set an all-time intraday high of $71.40 on Jan. 29 with the stock 7.9% below this high.

The weekly chart will shift to negative given a close this week below its key weekly moving average at $63.59. Weakness has held this moving average for three weeks in a row, helped by the location of monthly and quarterly technical levels at $63.82 and $63.61, respectively.

Investors looking to buy Alaska Air should enter a "good 'til canceled" limit order to buy weakness to a semiannual technical level at $53.63.

Investors looking to book profits should employ a sell stop on a weekly close below the key weekly moving average which will be rising each week from the current level of $63.59.

Delta Airlines ($45.15) is down 8.2% so far in 2015 after setting an all-time intraday high of $51.06 on Jan. 23. The stock is 12% below its high. Note that the Feb 13 low of $43.35 held an annual technical level of $43.59.

The weekly chart stays negative on a close this week below its key weekly moving average at $45.91.

Investors looking to buy Delta should enter a "good 'til canceled" limit order to buy weakness to a semiannual technical level at $37.04.

Investors looking to book profits should enter "good 'til canceled" limit orders to sell strength to monthly and quarterly technical levels at $46.98 and $53.50, respectively.

JetBlue ($17.94) is up 13% so far in 2015 and set its all-time intraday high of $18.20 on Feb. 25.

The weekly chart stays positive but overbought on a close this week above its key weekly moving average at $16.66.

Investors looking to buy JetBlue should enter a "good 'til canceled" limit order to buy weakness to a quarterly technical level at $14.34.

Investors looking to book profits should employ a sell stop on a weekly close below the key weekly moving average which will be rising each week from the current level of $16.66.

Southwest Air ($44.01) is up 4% so far in 2015 and set an all-time intraday high of $47.17 on Jan. 29 with the stock 6.7% below this high.

The weekly chart shifts to negative given a close on Friday below its key weekly moving average at $43.27.

Investors looking to buy Southwest should enter a "good 'til canceled" limit order to buy weakness to a quarterly technical level at $40.57.

Investors looking to book profits should employ a sell stop on a weekly close below the key weekly moving average which will be rising each week from the current level of $43.27.

United Continental ($68.67) is up 2.7% so far in 2015 and set an all-time intraday high of $74.52 on Jan. 26 with the stock 7.9% below this high.

The weekly chart shifts to negative given a close on Friday below its key weekly moving average at $66.66.

Investors looking to buy United should enter "good 'til canceled" limit orders to buy weakness to quarterly and semiannual technical levels at $65.09 and $50.22, respectively.

Investors looking to book profits should employ a sell stop on a weekly close below the key weekly moving average which will be rising each week from the current level of $66.66.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.