How do I sort this array by “departureIcao”?
I have tried many, many ways using array_multisort() & array_column(). Just not getting the idea here. Please, any help?

Array
(
    [AAL1122] => Array
        (
            [callsign] => AAL1122
            [departureIcao] => SKBO
            [arrivalIcao] => KDFW
            [wakeClass] => M
            [onGround] => 
            [state] => En Route
            [flightRules] => I
        )

    [AAL190] => Array
        (
            [callsign] => AAL190
            [departureIcao] => KORD
            [arrivalIcao] => KJFK
            [wakeClass] => H
            [onGround] => 1
            [state] => Boarding
            [flightRules] => I
        )

    [AAL950] => Array
        (
            [callsign] => AAL950
            [departureIcao] => SBGR
            [arrivalIcao] => KJFK
            [wakeClass] => H
            [onGround] => 
            [state] => En Route
            [flightRules] => I
        )
)

My last 2 tries were:

$a = array_multisort(array_column($flights, 'departure_icao'), SORT_ASC, $flights);
$a = array_multisort(array_column($flights,'departure_icao'), $flights);

I have read (and tried) the several examples given in similar posts. Just keep getting errors.