Let me try something here..

How many powerful companies have we heard of with Lost that just don't all add up?

Mittleos Bioscience
Dharma Initive
Hanso Group
Whitmore Industires
Paik
and there could be others.. If it ends up that they are all working together I do not see why they can't fake a plane crash.. We know there are people on the island taking samples of blood and whatever.. IMHO I think it is possible..

__________________
Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.