(12) Net Loss Per Share:

The reconciliation of the net loss per share calculation is as follows:



	For the three months ended				For the nine months ended
	September 30,				September 30,

($ in millions and shares in thousands, except per share amounts)	2018		2017		2018		2017

Net loss used for basic and diluted loss
per share:
Net loss attributable to Frontier common shareholders	$	(426)	$	(92)	$	(531)	$	(936)
Less: Dividends paid on unvested restricted stock awards		-		-		-		(2)
Total basic net loss
attributable to Frontier common shareholders	$	(426)	$	(92)	$	(531)	$	(938)
Effect of loss related to dilutive stock units		-		-		-		(2)
Total diluted net loss
attributable to Frontier common shareholders	$	(426)	$	(92)	$	(531)	$	(940)

Basic loss per share:
Total weighted average shares and unvested restricted stock
awards outstanding - basic		105,740		78,488		88,997		78,399
Less: Weighted average unvested restricted stock awards		(2,075)		(691)		(1,859)		(685)
Total weighted average shares outstanding - basic	$	103,665	$	77,797	$	87,138	$	77,714

Basic net loss per share
attributable to Frontier common shareholders	$	(4.11)	$	(1.19)	$	(6.09)	$	(12.06)

Diluted loss per share:
Total weighted average shares outstanding - basic		103,665		77,797		87,138		77,714
Effect of dilutive stock units		-		-		-		161
Total weighted average shares outstanding - diluted	$	103,665	$	77,797	$	87,138	$	77,875

Diluted net loss per share
attributable to Frontier common shareholders	$	(4.11)	$	(1.19)	$	(6.09)	$	(12.07)

In calculating diluted net loss per common share for the three and nine months ended September 30, 2018 and 2017, the effect of all common stock equivalents is excluded from the computation as the effect would be antidilutive.

Stock Options

For the three and nine months ended September 30, 2018 and 2017, previously granted options to purchase 1,334 and 2,664 shares, 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 September 30, 2018 and 2017, we had 299,827 and 161,020 stock units, respectively, issued under the Non-Employee Directors’ Deferred Fee Equity Plan (Deferred Fee Plan), the Non-Employee Directors’ Equity Incentive Plan (Directors’ Equity Plan), the 2013 Equity Incentive Plan and the 2017 Equity Incentive Plan. These securities have not been included in the diluted EPS calculation for the nine months ended September 30, 2018 and 2017 because their inclusion would have an antidilutive effect. Compensation costs associated with the issuance of stock units were $1 and $(4) million for the nine months ended September 30, 2018 and 2017, respectively.

Mandatory Convertible Preferred Stock

The impact of the common share equivalents associated with approximately 19,250,000 shares of Series A Preferred stock were not included in the diluted EPS calculation as of September 30, 2017, as their impact was antidilutive.