To get into the air would require a lot of thrust. Being a ground mech it's gonna need to take some punishment, so heavy armor would weigh it down. Then while in the air to transform into a plane would need some balance, can't have it falling over in mid transformation because of moving parts.
Maybe, but not anytime soon.
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Yeah they're not that heavily armored. Its not like they can take on tanks or anti-armor for long. They'll get blasted by those. They're mainly used for infantry support and backing up air transports.