What is this movie? Bombed jetliner lands on iceberg?

What is this movie? 1960s? Thriller.

A senator (?) is flying on a new 4-engine jetliner, e.g. 707 or DC-8.

As he's boarding, someone gives him a gift of a rare wine, except it's a bomb. They timed it so it's too late for checked baggabe, and they know his seat is near critical flight controls. Except his aide finds a way to get it in checked baggage anyway.

Over the Atlantic, the bomb damages the plane and one engine. The pilots manage to land on an iceberg. That section of the iceberg breaks off, putting them on a much smaller iceberg.

To keep the plane from sliding off, they disembark the plane and set the tires on fire so the gear melts into the ice and refreezes, then reembark the plane. They have enough compressed air to restart an engine for heat and light.

They realize they are close to land. They start all working engines and attempt to thrust the iceberg to shore.

A Soviet researcher using sat photos notes an iceberg is going the wrong way. He escalates this and somehow it gets to the people worried that the Americans have blamed the Soviets for the aircraft loss. They tell the Americans, rescue, bad guys' comeuppance, happily ever after.