What are 21 Air's main hubs?

21 Air operates most from Cincinnati (CVG), Miami (MIA), San Juan (SJU).

How large is 21 Air's fleet?

Fleet details for 21 Air are being gathered.

How many destinations does 21 Air fly to?

21 Air serves 21 direct destinations based on recent route data.

AIRLINE · UNITED STATES

21 Air

IATA 2IICAO CSBHQ CVG

Aircraft

Aircraft types

Destinations

Hubs & gateways

21 Air (2I/CSB) is a carrier based in United States. Its tracked network spans 21 destinations from 18 hubs, led by Cincinnati (CVG).

Live flights on FlightRadar24 ↗View seat maps

ROUTE NETWORK18 hubs

Cincinnati · Primary hub

HUBS & TOP AIRPORTS

Operates from 18 airports

Sortable by destinations served or daily frequency. Click any column to re-rank.

TOP HUB · 01CVG

Cincinnati

Cincinnati/Northern Kentucky International Airport

destinations

9–10

flights/day

See routes from CVG →

TOP HUB · 02MIA

Miami

Miami International Airport

destinations

9–10

flights/day

See routes from MIA →

TOP HUB · 03SJU

San Juan

Luis Munoz Marin International Airport

destinations

3–4

flights/day

See routes from SJU →

Hubs and top airports for 21 Air, fleet and route data as of April 2026
#	AIRPORT	CITY	REGION	DESTINATIONS ↓	FLIGHTS / DAY
1	CVGCincinnati/Northern Kentucky International Airport	Cincinnati	North America	11	9–10
2	MIAMiami International Airport	Miami	North America	7	9–10
3	SJULuis Munoz Marin International Airport	San Juan	North America	5	3–4
4	BWIBaltimore/Washington International Airport	Baltimore	North America	3	3–4
5	DENDenver International Airport	Denver	North America	3	3
6	ELPEl Paso International Airport	El Paso	North America	2	1–2
7	MCOOrlando International Airport	Orlando	North America	2	1–2
8	AUSAustin-Bergstrom International Airport	Austin	North America	2	1–2
9	SLCSalt Lake City International Airport	Salt Lake City	North America	2	2
10	GSOGSO		Other	1	1–2

ROUTES & DESTINATIONS

Flies to 21 cities

Pick an origin hub to see its place in the network.

CVG Cincinnati

View airport ↗

destinations

9–10

flights/day

North

region

TOP ROUTES FROM CVG

MIAMiami3–4/day SJUSan Juan1/day ELPEl Paso1/day MCOOrlando1/day BWIBaltimore1/day GSOGreensboro1/day HRLHarlingen1/day SFOSan Francisco1/day

ROUTES FROM CVG

DESTINATIONS

Every 21 direct destinations

Sortable by daily frequency or hubs served. Each city links to its airport.

⌕

21 / 21

Direct destinations from 21 Air, route data as of April 2026
#	DESTINATION	COUNTRY	HUBS	FLIGHTS / DAY ↓
1	CVGCincinnati	US	14	10–11
2	MIAMiami	US	5	6–7
3	SJUSan Juan	US	2	3–4
4	BWIBaltimore	US	3	2–3
5	BOGBogota	CO	2	2
6	DENDenver	US	2	2
7	ELPEl Paso	US	2	1–2
8	MCOOrlando	US	2	1–2
9	HRLHarlingen	US	2	1–2
10	UIOQuito	EC	1	1
11	BOSBoston	US	1	1
12	GSOGreensboro	US	1	1
13	SANSan Diego	US	1	1
14	SFOSan Francisco	US	1	1
15	SDQSanto Domingo	DO	1	1
16	AUSAustin	US	1	1
17	BQKBrunswick	US	1	1
18	MDEMedellin	CO	1	1
19	POSPort of Spain	TT	1	1
20	SDFLouisville	US	1	1
21	SLCSalt Lake City	US	1	1

21 Air

Operates from 18 airports

Flies to 21 cities

Every 21 direct destinations

Other airlines based in United States

Aircraft operated