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Norwegian company Lufttransport have a scheduled route BOO – VRY using the AgustaWestland AW139 helicopter. This helicopter has 15 seats. It's a bit heavier and longer than some small fixed-wing aircrafts, but certainly much narrower. Dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

For comparison, the Twin Otter DHC-6 Series 100 has:

Length: 15.77 m
Width: 19.8 m (wingspan)
Height: 5.9 m
Empty weight: 2,653 kg

The Britten-Norman BN-2A Islander is shorter, lower, and lighter yet, but as a fixed-wing aircraft, remains much wider than the AgustaWestland. For most definitions of "smaller", the Britten-Norman would win, but if you're looking for the most compact "plane", the AgustaWestland helicopter flying to Værøy wins.

Norwegian company Lufttransport have a scheduled route between Bodø Airport and Værøy Heliport using the AgustaWestland AW139 helicopter (Værøy Airport has been closed since a Twin Otter fatally crashed). This helicopter has 15 seats. It's a bit heavier and longer than some small fixed-wing aircrafts, but certainly much narrower. Dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

For comparison, the Twin Otter DHC-6 Series 100 has:

Length: 15.77 m
Width: 19.8 m (wingspan)
Height: 5.9 m
Empty weight: 2,653 kg

The Britten-Norman BN-2A Islander is shorter, lower, and lighter yet, but as a fixed-wing aircraft, remains much wider than the AgustaWestland. For most definitions of "smaller", the Britten-Norman would win, but if you're looking for the most compact "plane", the AgustaWestland helicopter flying to Værøy wins.

Norwegian company Lufttransport have a scheduled route BOO – VRY using the AgustaWestland AW139 helicopter. This helicopter has 15 seats. You specified smallest, so here are the dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

For comparison, the Twin Otter DHC-6 Series 100 has:

Length: 15.77 m
Width: 19.8 m (wingspan)
Height: 5.9 m
Empty weight: 2,653 kg

So although the AgustaWestland is a bit longer and heavier than the Twin Otter, it is less high and certainly much less wide. So whichever is smaller depends on how you want to define the size.

Norwegian company Lufttransport have a scheduled route BOO – VRY using the AgustaWestland AW139 helicopter. This helicopter has 15 seats. It's a bit heavier and longer than some small fixed-wing aircrafts, but certainly much narrower. Dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

For comparison, the Twin Otter DHC-6 Series 100 has:

Length: 15.77 m
Width: 19.8 m (wingspan)
Height: 5.9 m
Empty weight: 2,653 kg

The Britten-Norman BN-2A Islander is shorter, lower, and lighter yet, but as a fixed-wing aircraft, remains much wider than the AgustaWestland. For most definitions of "smaller", the Britten-Norman would win, but if you're looking for the most compact "plane", the AgustaWestland helicopter flying to Værøy wins.

Norwegian company Lufttransport have a scheduled route BOO – VRY using the AgustaWestland AW139 helicopter. This helicopter has 15 seats. You specified smallest, so here are the dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

Norwegian company Lufttransport have a scheduled route BOO – VRY using the AgustaWestland AW139 helicopter. This helicopter has 15 seats. You specified smallest, so here are the dimensions from Wikipedia:

Length: 16.66 m (54 ft 8 in)
Width: 2.26 m (10 ft 0 in)
Height: 4.98 m (16 ft 4 in)
Empty weight: 3,622 kg (7,985 lb)

For comparison, the Twin Otter DHC-6 Series 100 has:

Length: 15.77 m
Width: 19.8 m (wingspan)
Height: 5.9 m
Empty weight: 2,653 kg

So although the AgustaWestland is a bit longer and heavier than the Twin Otter, it is less high and certainly much less wide. So whichever is smaller depends on how you want to define the size.