Let's be clear: It is the Atheist's First Amendment right to speak their opinion – but it is also the pilots' right to refuse to promote their message. I applaud these pilots for knowing their rights and for having the courage to stand for what they believe in.
We are so blessed to live in "one nation, under God" and it is our responsibility and our privilege to protect the rights and liberties we have been given...by Him.
Update:
On the American Atheists own website some comments were:
"The first statement can easily be read to imply "Atheism is Patriotic, Religion is Not," by a biased viewer. Point of fact: biased viewers comprise most of the intended audience. Why put it up in the first place?"
"'God-LESS America' makes it sound like we want to kick religion out of America entirely. Maybe you do, but I only want to eat my piece of the pie in [peace]."
"I don't want Jehovah's Witnesses or evangelicals at my door, and I don't want you either. You're all just annoying. Start minding your own business and leave people alone."
WND made a great point:
The American Atheists cites Thomas Jefferson's letter to the Danbury Baptists as evidence that the Founding Fathers intended to keep religion out of government. But they don't mention the opening prayer of the very first Continental Congress in 1774.
That includes, in part:
"O Lord our Heavenly Father, high and mighty King of kings, and Lord of lords, who dost from thy throne behold all the dwellers on earth and reignest with power supreme and uncontrolled over all the Kingdoms, Empires and Governments; look down in mercy, we beseech Thee, on these our American States, who have fled to Thee from the rod of the oppressor and thrown themselves on Thy gracious protection, desiring to be henceforth dependent only on Thee. To Thee have they appealed for the righteousness of their cause; to Thee do they now look up for that countenance and support, which Thou alone canst give. Take them, therefore, Heavenly Father, under Thy nurturing care; give them wisdom in Council and valor in the field; defeat the malicious designs of our cruel adversaries; convince them of the unrighteousness of their Cause and if they persist in their sanguinary purposes, of own unerring justice, sounding in their hearts, constrain them to drop the weapons of war from their unnerved hands in the day of battle! Be Thou present, O God of wisdom, and direct the councils of this honorable assembly; enable them to settle things on the best and surest foundation. That the scene of blood may be speedily closed; that order, harmony and peace may be effectually restored, and truth and justice, religion and piety, prevail and flourish amongst the people. Preserve the health of their bodies and vigor of their minds; shower down on them and the millions they here represent, such temporal blessings as Thou seest expedient for them in this world and crown them with everlasting glory in the world to come. All this we ask in the name and through the merits of Jesus Christ, Thy Son and our Savior. Amen."