• United Airlines just took a subtle jab at its two biggest rivals as it aims to position itself as premium. • It promised to have uncrowded lounges and touted how many planes now have seatback entertainment. • Delta has struggled with long lines at its Sky Clubs. And American eschews seatback entertainment.

United Airlines just threw a subtle jab at its two biggest rivals.

The carrier on Thursday said it was focused on a host of "premium" moves, including making sure its airport lounges don't get "overcrowded" — an obvious swipe at Delta Air Lines, which continues to face long lines outside some of its popular Sky Clubs.

But it didn't stop there. It tweaked American Airlines, too.

United, during its Thursday earnings call with investors, touted its growing number of seatback scree

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