CANT AIRLIFT LAND FORCES

FOR SOME REASON WHEN I AIRDROP AN AIR CONSTRUCTION UNIT AND IT BUILDS A REMOTE DEPOT I STILL CAN NOT AIRLIFT ANYTHING THERE. USUALLY IT TAKES SOME TIME BUT ITS BEEN 2 WARS NOW AND I STILL CANT LIFT TROOPS. CAN YOU PLEASE TELL ME WHATS GOING ON? MY COUNTRY IS AAA.
THANKS ALOT