Delta, American, United, Southwest, JetBlue, Alaska and Hawaiian airlines last week posted profits for the second quarter.
Delta said its net income for the June quarter was $889 million, excluding special items, up $45 million from this time last year.
American reported a $1.5 billion profit, excluding special charges, a record for any quarter in the history of the company and a 114 percent improvement over last year.
United reported second-quarter 2014 net income of $919 million, excluding special items, an increase of 51 percent year over year.
Southwest posted record quarterly net income of $485 million, excluding special items, compared with second-quarter 2013 net income of $274 million.
JetBlue said it earned a $61 million, excluding special items, for the three-month period. This compares with the carrier's second quarter 2013 profit of $36 million.
Alaska posted adjusted net income of $157 million compared with adjusted net income of $105 million in 2013.
Hawaiian said its adjusted net income for the quarter was $22.4 million, an increase of $9.7 million year over year.