“Air Canada Q3 Profit Down” is a statement of fact.
“Westjet Profits Take Massive Plunge” is a statement of fact slanted by editorializing.
One is objective reporting, the other is reporting in which the reporter's objectivity has been compromised.
But keep in mind that authors of news reports and authors of headlines are not necessarily the same person. One is trying to report the news. The other is trying to sell the news.