(13) Net Loss Per Common Share:

The reconciliation of the net loss per common share calculation for the years ended December 31, 2017, 2016 and 2015 is as follows:




($ in millions and shares in thousands, except per share amounts)	2017		2016		2015

Net loss used for basic and diluted earnings (loss)
per share:
Net loss attributable to Frontier common shareholders	$	(2,018)	$	(587)	$	(316)
Less: Dividends paid on unvested restricted stock awards		(2)		(3)		(3)
Total basic net loss attributable to Frontier
common shareholders	$	(2,020)	$	(590)	$	(319)

Effect of loss related to dilutive stock units		-		-		-
Total diluted net loss attributable to Frontier
common shareholders	$	(2,020)	$	(590)	$	(319)

Basic earnings (loss) per share:
Total weighted average shares and unvested restricted stock
awards outstanding - basic		78,409		78,142		72,787
Less: Weighted average unvested restricted stock awards		(673)		(535)		(479)
Total weighted average shares outstanding - basic		77,736		77,607		72,308

Basic net loss per share attributable to Frontier
common shareholders	$	(25.99)	$	(7.61)	$	(4.41)

Diluted earnings (loss) per share:
Total weighted average shares outstanding - basic		77,736		77,607		72,308
Effect of dilutive shares		-		-		-
Total weighted average shares outstanding - diluted		77,736		77,607		72,308

Diluted net loss per share attributable to Frontier
common shareholders	$	(25.99)	$	(7.61)	$	(4.41)

In calculating diluted net loss per common share for the years ended December 31, 2017, 2016, and 2015 the effect of all common stock equivalents is excluded from the computation as the effect would be antidilutive.

Stock Options

For the years ended December 31, 2017, 2016 and 2015, options to purchase 1,334, 2,667 and 3,333 shares, respectively, issuable under employee compensation plans were excluded from the computation of diluted earnings (loss) per share (EPS) for those periods because the exercise prices were greater than the average market price of our common stock and, therefore, the effect would be antidilutive.

Stock Units

At December 31, 2017, 2016 and 2015, we had 203,952, 125,431, and 95,812 stock units, respectively, issued under the Director Plans and the 2013 EIP. These securities have not been included in the diluted income per share of common stock calculation because their inclusion would have an antidilutive effect.

Mandatory Convertible Preferred Stock

The impact of the common share equivalents associated with approximately 19,250,000 shares of Series A Preferred stock described above were not included in the calculation of diluted EPS as of December 31, 2017 and 2016, as their impact was antidilutive.