Tuesday promises to be one of the busiest days of the current earnings season, with key reports due from Apple (AAPL - Get Report) and a number of other significant players in technology, big pharma and telecommunications.

In addition, three names in the aerospace and defense industry will be posting their latest reports.

L3 Technologies Expected to Earn $2.71 a Share

L3 Technologies Inc (LLL - Get Report) is expected to report earnings of $2.71 a share on sales of $2.7 billion before the market opens Jan. 29, based on a FactSet survey of 14 analysts. In the same period a year ago the company posted earnings of $2.35 a share on sales of $2.6 billion.

The stock has fallen 9.7% since the company last reported earnings on Oct. 25.

Quarterly estimates have fallen 2.5 cents a share in the past month. L3 Technologies is currently trading at a price-to-forward-earnings ratio of 15.7 based on the 12-month estimates of 15 analysts surveyed by FactSet.

Lockheed Martin Revenue Expected to Fall 9.2% to $13.7 billion

Lockheed Martin Corporation (LMT - Get Report) is expected to report earnings of $4.40 a share on sales of $13.7 billion before the market opens Jan. 29, based on a FactSet survey of 18 analysts. In the same period a year ago the company posted earnings of $4.30 a share on sales of $15.1 billion.

The stock has fallen 10.7% since the company last reported earnings on Oct. 23. Quarterly estimates have risen 1.7 cents a share in the past month.

Lockheed Martin is currently trading at a price-to-forward-earnings ratio of 14.4 based on the 12-month estimates of 21 analysts surveyed by FactSet.

Harris Expected to Earn $1.90 a Share

Harris Corporation (HRS) is expected to report earnings of $1.90 a share on sales of $1.6 billion before the market opens Jan. 29, based on a FactSet survey of 11 analysts. In the same period a year ago the company posted earnings of $1.67 a share on sales of $1.5 billion.

The stock has fallen 7.4% since the company last reported earnings on Oct. 14. Quarterly estimates have fallen less than 1 cent a share in the past month.

Harris is currently trading at a price-to-forward-earnings ratio of 16.7 based on the 12-month estimates of 12 analysts surveyed by FactSet.

More big names in Aerospace and Defense are slated to report later this week. The latest numbers from General Dynamics (GD - Get Report) and Boeing (BA - Get Report) are due before the market opens on Wednesday, Jan. 30.

Raytheon Co. (RTN - Get Report) and Northrop Grumman (NOC) are expected to report Thursday morning.

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