You'll do much better if you ship the plants back to yourself rather than carrying them.
1) They must be bare root and clean of all organic potting medium.
2) You must have CITES documents issued by the country the plants originated in.
3) You must have a phytosanitary certificate as well.
Assuming you have not tried to import any Appendix I plants (that'll get them confiscated and you fined or jailed), they must go to the APHIS inspection station and be cleared before they can move on in the US.
I don't know the details of that process or where that is at LAX, but I'd guess that 3 hours won't do it.
If you ship them via EMS, on the other hand, they will go by air to the APHIS station nearest your home, will be cleared and will be express mailed to you at no charge.
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